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Genetics Problem Set 3 - involved We can assume that Wild...

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Problem Set 3 Problem 40: Cross 1: Parents: Dark purple ( MMwwDd ) x White with yellowish spots (mmwwdd) Progeny: ½ Dark purple ( MmwwDd ) and ½ light purple (Mmwwdd) Cross 2: Parents: White with yellowish spots (mmWwDd) x Light purple (MMwwdd) Progeny: ½ white with purple spots (MmWwDd or MmWwdd) ; ¼ Dark purple (MmwwDd ); ¼ Light purple (Mmwwdd) Problem 43: 1) From the crosses 1 and 2 we can see that the wild type coat color is dominant to both platinum and Aleutian. From the 3 rd cross and the phenotypic ratio of 133:41:46:17 (9:3:3:1) we can see that this is a dihybrid cross and two alleles are
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Unformatted text preview: involved. We can assume that: Wild Type A_B_ Platinum aaB_ or A_bb (Assume A_bb) Aleutian A_bb or aaB_ (Assume aaB_) Sapphire aabb When pure lines of the above genotypes are crossed in Cross 1,2,and 3, the F1 and F2 progeny genotype ratios match those shown in the problem table, proving the assumed genotypes to be true. 2) aabb x AAbb (sapphire x platinum) F1: all Aabb (all platinum) F2: ¾ Aabb ¼ aabb ( ¾ platinum ¼ sapphire) 3:1 aabb x aaBB (sapphire x Aleutian) F1: all aaBb (all Aleutian) F2: ¾ aaBb ¼ aabb ( ¾ aleutian ¼ sapphire) 3:1...
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