lecture 1-25 heredity, different patterns

lecture 1-25 heredity, different patterns - Chapter...

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Chapter 14 (continued) – Patterns of inheritance Learning objectives •Explain how phenotypic expression of the heterozygote differs with complete dominance, incomplete dominance, and codominance (know examples for each). •Be able to recognize and solve problems involving other different modes of inheritance such as: multiple alleles, lethal dominant gene, X-linked genes, environmentally influenced genes, continuous variance. •Learn how to predict, from a trihybrid cross between two individuals that are heterozygous for all three traits, what expected proportion of the offspring would be: - homozygous dominant for the three traits - heterozygous for all three traits - homozygous recessive for two specific traits and heterozygous for the third •Define and give examples of pleiotropy and epistasis. • Remember that the term ‘phenotype’ refers to physiologically expressed traits, as well as physically expressed traits (appearance) of an individual.
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By following a single trait, Mendel observed: - Offspring from a F1 cross were monohybrids, heterozygous for one character… and thus derived the law of segregation The two alleles (of a pair) for a heritable character separate (segregate) during gamete formation and end up in different gametes Recall from Monday’ lecture…
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By following two characters at the same time, in other words,… Crossing two, true-breeding parents differing in two characters – Produced dihybrids in the F 1 generation, heterozygous for both characters Mendel identified his second law of inheritance, the law of independent assortment Each pair of alleles segregates independently during gamete formation
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