presentation_11 - The importance of variation Descent with...

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1 The importance of variation • Descent with modiFcation implies the presence of heritable variation. • Natural selection requires heritable variation in reproductive success (“Ftness”). • Phenotype is the constellation of observable traits for an individual — flower color in Clarkia xantiana . Phenotype and genotype Genes involved in biosynthetic pathway of anthocyanin production Genotype is the genetic endowment of a particular individual (either across the whole genome or for a single gene)
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2 Phenotype changes (sometime dramatically) during the course of development. Genetic Environmental • Distinction between soma and germ line is very clear in familiar organisms like insects and vertebrates, because. Heritability is solely the province of germ cells. These cells give rise to gametes that pass on genes to subsequent generations. • Distinction between soma and germ line is very clear in familiar organisms like insects and vertebrates, because the germ line sequestered early in development. • In plants and many invertebrates, other tissues remain “totipotent” and can give rise to germ cells.
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presentation_11 - The importance of variation Descent with...

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