Question

23. You have two pure breeding fruit flies, with a wing shape that can be can...

23. You have two pure breeding fruit flies, with a wing shape that can be can be either normal (N) or (Vesgial) (n) and have Red Eyes or (R) or white (r).  A normal and white fly is crossed with a vestigial red eyed fly. The resulting F1 plats are crossed. A total of 640 F2 progeny are phenotypically observed: (16 Points)

360 Normal and Red

120 Normal and White

120 Vestigial and Red

  40 Vestigial and White

  1. What is the phenotypic ratio observed for pod color and pod shape, individually?
  2. B. What is the phenotypic ratio observed for pod color and pod shape, together?
  3. What is the dominance relationship for each trait?
  4. What are the genotypes of the P and F1 generations. (Use R and r and N and N for the traits)?
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Answer #1

A.

Total reds = 360 + 120 = 480

Ratio = 480/640 = 0.75

Total whites = 120 + 40 = 160

Ratio = 160/640 = 0.25

Total normal = 360 + 120 = 480

Ratio = 0.75

Total vestigeal = 120 + 40 = 160

Ratio = 0.25

B.

Normal red = 360/640 = 0.5625

Normal white = 120/640 = 0.1875

Vestigeal red = 120/640 = 0.1875

Vestigel white = 40/640 = 0.0625

C.

Normal wings are dominant over vestigeal.

White pods are dominant over red pods.

(White vestigeal is least in number, so it will be recessive).

D.

P1 : RRNN × rrnn

F1 : RrNn

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