HardyWeinberg - The HardyWeinberg Principle Objectives...

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The Hardy- Weinberg Principle
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Review –Speciation and allele frequencies D.4.1 – Explain how the Hardy-Weinberg equation is derived. D.4.2 – Calculate allele, genotype, and phenotype frequencies for two alleles of a gene using the Hardy-Weinberg equation . D.4.3 – State the assumptions made when the Hardy- Weinberg equation is used. Objectives
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The word species is Latin for “kind”. What kind of animal is that? What species of animal is that? Species are based on interfertility, not physical sim- ilarity: Can things breed together? Species definition
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A species is a group of populations whose individuals have the potential to interbreed and produce fertile offspring. Populations of a species… may be isolated from each other, or they may inter- grade with low densities in an intermediate region. are far more likely to breed with members of the same population than with mem- bers of other populations. Ex: the domesticated dog ( Canis lupus familiaris ) has become isolated from its parent species, the gray wolf ( Canis lupus ), but can still mate occasionally and produce fertile offspring. Species definition
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Speciation – the formation of a new species by the splitting of an existing species. Allopatric speciation : Geographic barriers lead to speciation. Mountain ranges, glaciers, land bridges, or splintering of lakes may divide one population into isolated groups. Speciation occurs in different geo- graphical areas. Isolated species must fail to inter- breed if reunited. Speciation
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Sympatric speciation : New populations can originate within the parent species (in the same geographical area). In plants, this results from accidents during cell division that produce extra sets of chromosomes: polyploidy . Or failure of meiotic disjunction Speciation
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A population is characterized by its genes. Genes can mutate, which produces variation within a species , o ne of the prerequisites of Darwinian evolution . As diploid beings, animals receive one set of genes from each parent Ex: BB, Bb, bb B & b are alleles , or versions of genes - eye color.
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