In fruit flies, straight wings are dominant and curly wings are recessive. What will the generations look like? Assume that Mendel’s method of crossing two true breeding parents with opposite traits is followed. Check all that apply.
Answer
A
The P generation has all straight wings.
B
The P generation has straight wings and curly wings.
C
The F1 generation has all straight wings.
D
The F1 generation has all curly wings.
E
The F1 generation has straight wings and curly wings.
F
The F2 generation has all straight wings.
G
The F2 generation has straight wings and curly wings.
Explanation
The true-breeding parents have opposite traits, so the P generation includes straight-winged and curly-winged flies. Crossing them gives F1 offspring that all inherit the dominant straight-wing allele and have straight wings. Crossing the F1 flies produces an F2 generation with both traits, typically about three straight-winged flies for every curly-winged fly.
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