Lecture 11 notes 10-15 (no slides)

Lecture 11 notes 10-15 (no slides) - Lecture 11 Genetic...

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Lecture 11 - Genetic Basis of Heredity (Fitch 10/15) Meiosis: How chromosomes are inherited - Process that makes haploid gametes from diploid organisms - Produces variation among gametes o Homologous chromosomes (maternal and paternal copies of the same chromosome) are segregated into different daughter cells during Meiosis I o Different chromosomes are assorted independently into the daughter cells during Meiosis I o Crossing-over between non-sister chromatids in Prophase I - Fertilization restores the diploid state in the zygote - Fertilization also produces different chromosome combinations - Charles Darwin vs. August Weissman - Darwin (1868): “pangenesis” o “gemmules” produced by the body influence gametes o Blending inheritance o Galton (1869-70) showed this does not occur via blood - Weissman: “germ plasm theory” o Germline passes heritable information without somatic influence o E.g., mutilations aren’t inherited.
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