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The whale flipper shares a similar morphology to breast cancer quilt pattern free quality lady era 100 mg appendages of birds and mammals (Figure 18 pregnancy 23 weeks generic 100 mg lady era with visa. For example women's health clinic ringwood order lady era 100 mg otc, the bones in the appendages of a human breast cancer awareness shirts cheap lady era 100 mg online, dog, bird, and whale all share the same overall construction (Figure 18. Over time, evolution led to changes in the shapes and sizes of these bones in different species, but they have maintained the same overall layout. Some structures exist in organisms that have no apparent function at all, and appear to be residual parts from a past common ancestor. Other examples of vestigial structures are wings on flightless birds, leaves on some cacti, and hind leg bones in whales. For example, species of unrelated animals, such as the arctic fox and ptarmigan, living in the arctic region have been selected for seasonal 474 Chapter 18 Evolution and the Origin of Species white phenotypes during winter to blend with the snow and ice (Figure 18. These similarities occur not because of common ancestry, but because of similar selection pressures-the benefits of not being seen by predators. Mutational tweaking in the embryo can have such magnified consequences in the adult that embryo formation tends to be conserved. As a result, structures that are absent in some groups often appear in their embryonic forms and disappear by the time the adult or juvenile form is reached. For example, all vertebrate embryos, including humans, exhibit gill slits and tails at some point in their early development. These disappear in the adults of terrestrial groups but are maintained in adult forms of aquatic groups such as fish and some amphibians. Great ape embryos, including humans, have a tail structure during their development that is lost by the time of birth. Groups that evolved since the breakup appear uniquely in regions of the planet, such as the unique flora and fauna of northern continents that formed from the supercontinent Laurasia and of the southern continents that formed from the supercontinent Gondwana. The presence of members of the plant family Proteaceae in Australia, southern Africa, and South America is best by their presence prior to the southern supercontinent Gondwana breaking up. Australia has an abundance of endemic species-species found nowhere else-which is typical of islands whose isolation by expanses of water prevents species to migrate. Fundamental divisions in life between the three domains are reflected in major structural differences in otherwise conservative structures such as the components of ribosomes and the structures of membranes. In science, a "theory" is understood to be a body of thoroughly tested and verified explanations for a set of observations of the natural world. Scientists have a theory of the atom, a theory of gravity, and the theory of relativity, each of which describes understood facts about the world. As such, a theory in science has survived significant efforts to discredit it by scientists. In contrast, a "theory" in common vernacular is a word meaning a guess or suggested explanation; this meaning is more akin to the scientific concept of "hypothesis. Individuals Evolve Evolution is the change in genetic composition of a population over time, specifically over generations, resulting from differential reproduction of individuals with certain alleles. If one measures the average bill size among all individuals in the population at one time and then measures the average bill size in the population several years later, this average value will be different as a result of evolution. Although some individuals may survive from the first time to the second, they will still have the same bill size; however, there will be many new individuals that contribute to the shift in average bill size. The theory of evolution explains how populations change over time and how life diversifies the origin of species. The mechanisms of the origin of life on Earth are a particularly difficult problem because it occurred a very long time ago, and presumably it just occurred once. Importantly, biologists believe that the presence of life on Earth precludes the possibility that the events that led to life on Earth can be repeated because the intermediate stages would immediately become food for existing living things. More effective reproducers would increase in frequency at the expense of inefficient reproducers. Organisms Evolve on Purpose Statements such as "organisms evolve in response to a change in an environment" are quite common, but such statements can lead to two types of misunderstandings. First, the statement must not be understood to mean that individual organisms evolve.
The process in which one haploid gamete joins with another haploid gamete is called fertilization zoladex menstrual cycle purchase 100 mg lady era with mastercard. After fertilization menopause 2 order 100 mg lady era overnight delivery, the cell has 2n chromosomes-n chromosomes from the female parent plus n chromosomes from the male parent menopause type 7 cheap lady era 100 mg otc. Because sex cells need half the number of chromosomes menstruation 35 day cycle order 100mg lady era with visa, a different process of cell division is needed. Meiosis is a kind of cell division that reduces the number of chromosomes by half through the separation of homologous chromosomes. During prophase I, replicated chromosomes, consisting of two sister chromatids, condense. The homologous chromosomes are held tightly together along their lengths by a protein that acts like a zipper. Crossing over occurs when a section of one chromosome changes place with a section of its homologous chromosome. Reading Essentials Chapter 10 Sexual Reproduction and Genetics 105 What happens during metaphase I During metaphase I, the pairs of homologous chromosomes line up in the center of the cell. During anaphase I, each homologous chromosome is guided by the spindle fibers toward opposite poles of the cell. The sister chromatids might not be identical because crossing over might have occurred during synapsis in prophase I. At the end of telophase I, the cell undergoes cytokinesis, meaning it divides into two cells. Label In the space provided, write the chromosome number (2n or n) for each phase. An important difference is that mitosis produces two identical diploid daughter cells, while meiosis produces four different haploid daughter cells. Mitosis Number of cell divisions Synapsis of homologous chromosomes Products Type of cells produced Purpose one does not occur two occurs during prophase I Picture this 8. Compare Fill in the blanks in the table with the number of daughter cells produced. Meiosis identical, diploid cells body cells growth and repair of body tissues nonidentical, haploid cells reproductive cells production of gametes for sexual reproduction Reading Essentials Chapter 10 Sexual Reproduction and Genetics 107 How does meiosis create genetic diversity One way that meiosis produces non-identical daughter cells occurs during prophase I. When pairs of homologous chromosomes line up at the center of the cell, they do so randomly. This means that each daughter cell gets a different, random assortment of chromosomes. Fertilization, when two haploid gametes combine, results in even more genetic variation. Asexual Reproduction Asexual reproduction occurs when the organism inherits all of its chromosomes from one parent. On the lines below, list some of the steps Mendel might have used to learn about the natural world. Mendel explained how a dominant allele can mask the presence of a recessive allele. This means that the female gamete is fertilized by a male gamete in the same flower. Through these experiments, Mendel made several hypotheses about how traits are inherited. That year marks the beginning of the science of genetics, the science of heredity. Check for Understanding As you read this section, highlight any parts you do not understand. The Inheritance of Traits Mendel used true-breeding pea plants-plants whose traits stayed the same from generation to generation. Mendel studied seven traits-flower color, seed color, seed pod color, seed shape, seed pod shape, stem length, and flower position. Chapter 10 Sexual Reproduction and Genetics 109 What did Mendel find when he crossed pea plants with different traits He saw that in these offspring, the F2 generation, three-fourths of the plants had yellow seeds and one-fourth had green seeds, a 3:1 ratio.
Developing a set of use case stories womens health zeeland order lady era 100mg free shipping, which personify specific healthcare delivery use cases women's health clinic des moines iowa lady era 100mg lowest price. Using a scenario-based approach to menstrual headache symptoms buy discount lady era 100mg online develop the use cases representing typical healthcare processes/functions menstruation rectal pain purchase 100 mg lady era visa. Several of the use cases are generic and can be used to support a number of other care scenarios. The resulting set of functions was mapped to the scenarios and refined (calibrated) and verified during the fieldwork in order to address any misconceptions or omissions. In order to illustrate the combined use of the various standards and to ensure interoperability, the architect perspective was documented using sequence diagrams (see Appendix D for an example), describing the sequence of information exchanges between workflow participants (or actors). Wherever possible, standards-based specifications/profiles have been leveraged and referenced. Page 30 National Health Normative Standards Framework for Interoperability in eHealth in South Africa 132nd session Agenda item 10. The messaging paradigm is core in eHealth and forms an essential foundation in the scenarios. It is a partial health record under the custodianship of a healthcare provider(s) that holds a portion of the relevant health information about a person over their lifetime [Canada Health Infoway, 2011a]. This is often described as a provider-centric or health organisation-centric partial health record of a person [Canada Health Infoway, 2011a]. One should be able to do searches in the registry based on demographic information (search by name, age, gender, etc. One should be capable of searching for providers by demographic information (names, roles, address, etc. It is responsible for the maintenance and search of facilities (service locations) within the system. Facilities data includes attributes such as name, physical locations, offered services, contact information, etc. It should support searching facilities by name, service offered and physical location. It is responsible for maintaining a register of where a particular type of healthcare equipment is located. Equipment data includes attributes such as type/name of equipment, model, physical location, uses, contact for use, etc. These repositories can be general purpose (such as a document repository) or targeted repositories for a specific purpose. Examples include a document repository, shared health records, lab repositories, imaging repositories, etc. It is responsible for providing a single, coherent set of interfaces through which consumer applications can communicate with registries. It includes: - Audit repository: Responsible for the storage of audits generated by various services within the health enterprise. It represents a federated audit platform that facilitates health systems monitoring and reporting. The audits sent to the audit repository are expected to be near realtime in nature and should contain the following information: who was involved in the clinical act, when the act occurred, where the act occurred, what information was affected, and how the information was affected. Edge devices: the physical hardware devices that will be used by end-users to access consumer applications. Four levels of technical maturity can be defined in healthcare information systems sharing electronic health record information with each other (see section 3. Page 35 National Health Normative Standards Framework for Interoperability in eHealth in South Africa 1. The approach adopted is to first consider existing standards that could meet the requirements, only adapt these when essential and only develop a new standard when there is no other alternative. Adherence to these principles would ensure that the research team could leverage international best practice and avoid duplication of effort, as well as ensuring that only tried and tested standards, which are already used in the development of software products, are selected for use.
They can be distinguished from sharks by their flattened bodies breast cancer 900 position 100 mg lady era mastercard, pectoral fins that are enlarged and fused to womens health news generic 100 mg lady era free shipping the head pregnancy induction purchase lady era 100mg with amex, and gill slits on their ventral surface (Figure 29 menstruation leg cramps 100mg lady era with mastercard. Nearly all bony fishes have an ossified skeleton with specialized bone cells (osteocytes) that produce and maintain a calcium phosphate matrix. This characteristic has only reversed in a few groups of Osteichthyes, such as sturgeons and paddlefish, which have primarily cartilaginous skeletons. The skin of bony fishes is often covered by overlapping scales, and glands in the skin secrete mucus that reduces drag when swimming and aids the fish in osmoregulation. Like sharks, bony fishes have a lateral line system that detects vibrations in water. Many bony fishes also have a swim bladder, a gas-filled organ that helps to control the buoyancy of the fish. Bony fishes are further divided into two extant clades: Actinopterygii (ray-finned fishes) and Sarcopterygii (lobe-finned fishes). Actinopterygii, the ray-finned fishes, include many familiar fishes-tuna, bass, trout, and salmon (Figure 29. Ray-finned fishes are named for their fins that are webs of skin supported by bony spines called rays. In contrast, the fins of Sarcopterygii are fleshy and lobed, supported by bone (Figure 29. Living members of this clade include the less-familiar lungfishes and coelacanths. The coelacanth, sometimes called a lobe-finned fish, was thought to have gone extinct in the Late Cretaceous period, 100 million years ago, until one was discovered in 1938 near the Comoros Islands between Africa and Madagascar. The term amphibian loosely translates from the Greek as "dual life," which is a reference to the metamorphosis that many frogs and salamanders undergo and their mixture of aquatic and terrestrial environments in their life cycle. Amphibians evolved during the Devonian period and were the earliest terrestrial tetrapods. Some species of salamanders and all caecilians are functionally limbless; their limbs are vestigial. An important characteristic of extant amphibians is a moist, permeable skin that is achieved via mucus glands that keep the skin moist; thus, exchange of oxygen and carbon dioxide with the environment can take place through it (cutaneous respiration). Additional characteristics of amphibians include pedicellate teeth-teeth in which the root and crown are calcified, separated by a zone of noncalcified tissue-and a papilla amphibiorum and papilla basilaris, structures of the inner ear that are sensitive to frequencies below and above 10,00 hertz, respectively. Amphibians also have an auricular operculum, which is an extra bone in the ear that transmits sounds to the inner ear. All extant adult amphibians are carnivorous, and some terrestrial amphibians have a sticky tongue that is used to capture prey. Evolution of Amphibians the fossil record provides evidence of the first tetrapods: now-extinct amphibian species dating to nearly 400 million years ago. Evolution of tetrapods from fishes represented a significant change in body plan from one suited to organisms that respired and swam in water, to organisms that breathed air and moved onto land; these changes occurred over a span of 50 million years during the Devonian period. However, it also had four limbs, with the skeletal structure of limbs found in present-day tetrapods, including amphibians. Therefore, it is thought that Acanthostega lived in shallow waters and was an intermediate form between lobe-finned fishes and early, fully terrestrial tetrapods. In 2006, researchers published news of their discovery of a fossil of a "tetrapod-like fish," Tiktaalik roseae, which seems to be an intermediate form between fishes having fins and tetrapods having limbs (Figure 29. Tiktaalik likely lived in a  shallow water environment about 375 million years ago. This led to the widespread distribution of tetrapods during the early Carboniferous period, a period sometimes called the "age of the amphibians. Amphibians can be divided into three clades: Urodela ("tailed-ones"), the salamanders; Anura ("tail-less ones"), the frogs; and Apoda ("legless ones"), the caecilians. Adult salamanders usually have a generalized tetrapod body plan with four limbs and a tail. They move by bending their bodies from side to side, called lateral undulation, in a fish-like manner while "walking" their arms and legs fore and aft. The majority of salamanders are lungless, and respiration occurs through the skin or through external gills.
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