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In Drosophila, genes a and b control body size and color, respectively. Large body (a+) is...

In Drosophila, genes a and b control body size and color, respectively. Large body (a+) is dominant over miniature (a), and gray body (b+) is dominant over ebony (b). The two genes are located at positions 32.0 and 40.0 on a particular autosome. Note that crossing-over does not occur in males. A miniature female that is homozygous for b+ was mated with an ebony male that is homozygous for a+. All the offspring were phenotypically wild-type (large body and gray)..

b. What types of offspring would you expect in the F2 generation, and in what percentages?

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Answer #1

Miniature female (aa) gray body (BB) mated with large body (AA) Ebony male (bb)

aaBB Vs AAbb

F1 AaBb - Large body and gray

AaBb Vs AaBb gametes are AB,Ab,aB,ab

AB Ab aB ab
AB AABB AABb AaBB AaBb
Ab AABb AAbb AaBb Aabb
aB AaBB AaBb aaBB aaBb
ab AaBb Aabb aaBB aabb

Ratio is 9:3:3:1

9 Large and gray (56.25%)

3 Large and bony (18.75%)

3 miniature gray  (18.75%)

1 miniature ebony (6.25)

AABB /AaBb/AABb/ AaBB - - 9/16 = 62.5%

AAbb/Aabb - large ebony body - 2/16

aaBB/aaBb - miniature gray  body -

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