A certain species of rabbit can have either black or grey fur. The allele for black fur is dominant over the allele for grey fur
. If a homozygous black rabbit is crossed with a heterozygous black rabbit, what phenotypic ratio will occur in the first generation?
A.
50% black : 50% grey
B.
100% black : 0% grey
C.
75% black : 25% grey
D.
25% black : 75
A.
50% black : 50% grey
B.
100% black : 0% grey
C.
75% black : 25% grey
D.
25% black : 75
2 answers:
The correct response is B
Assuming the black fur allele is B and the white fur allele is b, breeding a homozygous black rabbit with a heterozygous black rabbit will lead to the outcomes shown in the punnet square below;
Genotypically, 50% of the offspring will be homozygous dominant, while the other 50% will be heterozygous. However, all offspring will display black fur because the black allele is dominant over the grey allele.
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