In a fruit fly experiment, grey body, normal winged (homozygous dominant) fruit flies were mated with black body, short winged (homozygous recessive) fruit flies. The F1 dihybrid females were then used in a test cross. If the genes are always linked and no crossing over occurs, what would be the predicted ratio in the F2 generation?

A. 9:3:3:3

B. 1:1:1:1

C. 3:1

D. 1:1

Question

Biology

Jazlyn Sullivan

25 January, 08:22

In a fruit fly experiment, grey body, normal winged (homozygous dominant) fruit flies were mated with black body, short winged (homozygous recessive) fruit flies. The F1 dihybrid females were then used in a test cross. If the genes are always linked and no crossing over occurs, what would be the predicted ratio in the F2 generation?

A. 9:3:3:3

B. 1:1:1:1

C. 3:1

D. 1:1

+5

Answers (1)

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Ann Scott · Answer 1

In a fruit fly experiment, grey body, normal winged (homozygous dominant) fruit flies were mated with black body, short winged (homozygous recessive) fruit flies. The F1 dihybrid females were then used in a test cross. If the genes are always linked and no crossing over occurs, what would be the predicted ratio in the F2 generation?

GG x bb = Gb, Gb, Gb and Gb F1 generation

grey body heterozygous offspring 4:0

Gb x Gb = GG, Gb, Gb, and bb F2 generation

3:1 three grey body fly and one black body fly