Disorder in males since they have a single x

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would have to inherit from both parents… These disorders are RECESSIVE, only acts like a dom. disorder in males since they have a single X chromosome… o Eggs on carry an X chromo; sperm cells carry an X or a Y. So, if dad passes along a faulty X it must go to a daughter. Whereas, females can pass along a faulty X to a son or a daughter. J Crossing over = exchange of gene sequences between HOMOLOGOUS chromos… results in the infinite number of genetic combinations possible in gametes… J Pleiotrophy (one gene can effect several phenotypes; ex. A gene that functions in eye AND hair color) vs. epistasis (one gene can affect the expression of a different gene; ex. If a gene on chromos #12 is active then a different gene on chromo # 18 is inactive) Topic 11 ~ Forces of Evolutionary Change Darwin – Why is he important? One of the first to propose a plausible theory of evolution that was backed with scientific data and observation. What did Darwin initially observe about species? Had way more babies than the environment could support and the babies varied greatly Darwin did not ‘invent’ evolution! Galapagos Island – chain of islands where Darwin first formulated his ideas on natural selection Theory of evolution by way of natural selection – Those organisms better adapted to their environment will survive to reproduce and pass on those traits. “survival of the fittest” – this is not a ‘physical fitness’ this is a GENETIC fitness. Natural selection is contingent on time and place, favoring those characteristics in a population that fit the current, local environment Macroevolution (big, evolution that occurs over many thousands and thousands of years) vs microevolution (small, evolution in microorganism that can occur relatively quickly) Differential reproductive success, descent with modification, change over time, etc….. How is artificial selection (human, man-made; ex. Selective breeding has given us many different varieties if dogs) different than natural selection (nature at work)? What is observed in number of offspring as we move towards larger more complex organisms – fewer babies What is ‘biogeography’? distribution of living things Populations are the units of evolution A population is a group of individuals living in the same place at the same time Species are organisms that can interbreed and produce fertile offspring
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