lecture_12__05 - Mendel's law of independent assortment:...

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Mendel’s law of independent assortment: each pair of alleles segregates independently Dihybrid cross (2 loci): example = seed color (Y locus) and seed shape (R locus) Y, yellow is dominant y, green, is recessive R, round is dominant r, wrinkled, is recessive YYRR yyrr Parental: yellow round crossed with green wrinkled x gametes: YR + yr F1 generation: YyRr
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F1 generation: YyRr gametes? If each locus segregates independently, then there should be 4 types of gametes: YR Yr yr yR If each locus did not segregate independently, then there should only be 2 types of gametes: YR yr in Mendel’s experiments with 7 pea characters, each segregated independently failure to segregate independently is an indication of linkage, to be discussed later. ...
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P F1 F2 Genotypes and phenotypes of the dihybrid F2 generation following independent segregation: Fig. 14.7
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Trihybrid example: A , B , and C are dominant, a , b , and c are recessive aa BB cc x AA bb CC gametes: a B c A b C aA bB cC F1: gametes: a b c + a b C + a B c + a B C + A b c + A b C + A B c + A B C A = abberant gait, B = brown coat, C = curly tail
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b c A b c A B c a b C a B c a B C A b C A B C a b c A b c A B c a b C a B c a B C A b C A B C ? what percentage of the offspring have all three dominant traits ? ? what percentage of
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lecture_12__05 - Mendel's law of independent assortment:...

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