BIS 2B Lecture 15: LECTURE-15
30 May 2020
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No on understood how heredity worked: solutions to the variation and heredity problems (cid:12254) Remains discrete but can be modi ed by environment: lamarckism inheritance does acquired characteristics (cid:12254) Solved problems of variation, heredity and adaptation: blending inheritance (cid:12254) (cid:12254) Hereditary materials from male and female parents mix to form o spring. Weismann"s infamous test: nearly 1000 mince across 20+ generations (cid:12254) (cid:12254) (cid:12254) Also disproved pangenesis (no pangenesis in mouse tails that move to gametes) Heredity is study of how genetic composition of organism (genotype) and the environment in uence its physical appearance (phenotype: stu we knew before mendel. Plant sex requires union of pollen and ovules. Animal sex requires union of sperm and egg(1830) True breeding lines, when mated, produce phenotypically uniform 1st gen (f1) o spring. These o spring often (not always)intermediate between the two parental phenotypes. F2 gen often contains mix of phenotypes, including the original parental types, plus f1 types.
