BIO SCI 97 Lecture 10: Lecture 10 Notes

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Gene interaction ii to express the corresponding phenotype, the individual is non penetrant for the trait. Penetrance - incomplete penetrance is when an individual with a particular genotype fails. Variable expressivity - the same mutant allele produces different phenotypes in different. The phenotype may vary from mild to severe, but individuals with the genotype individuals will express some form of the associated phenotype. Waardenburg syndrome - dominant trait, range of symptoms, each individual inheriting trait will have a symptom from the range. Sex-limited traits - the sex of an organism can influence gene expression due to differing hormone profiles. Both sexes carry the genes for such traits, but they are expressed in just one sex. Mammalian breasts and ability to produce milk are female specific traits. Horn development is limited to males in some sheep, cows, and hoofed animals. Sex-influenced traits - those in which the phenotype corresponding to a particular genotype differs depending on the sex of the organism.

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