In cabbage butterflies, white color (W) is domi- nant and yellow color (w) is recessive. If a pure white cabbage butterfly mates with a yellow cab- bage butterfly, all the resulting (F,) butterflies are heterozygous white. Which cross represents the genotypes of the parent generation? (1) Ww x ww (2) WWx Ww (3) WWxww (4) Wwx Ww
Question
In cabbage butterflies, white color (W) is domi- nant and yellow color (w) is recessive. If a pure white cabbage butterfly mates with a yellow cab- bage butterfly, all the resulting (F,) butterflies are heterozygous white. Which cross represents the genotypes of the parent generation? (1) Ww x ww (2) WWx Ww (3) WWxww (4) Wwx Ww
Solution
To determine the genotypes of the parent generation, we need to analyze the information given in the question.
We are told that white color (W) is dominant and yellow color (w) is recessive in cabbage butterflies.
If a pure white cabbage butterfly mates with a yellow cabbage butterfly, and all the resulting butterflies are heterozygous white, we can conclude that the pure white cabbage butterfly must be homozygous dominant (WW) and the yellow cabbage butterfly must be homozygous recessive (ww).
Therefore, the cross that represents the genotypes of the parent generation is (3) WW x ww.
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