In the fur of foxes, silver-black color is governed by a recessive allele (r) and red color by its dominant allele (R). What will be the phenotypic percentages of a cross between a heterozygous red fox and a silver black fox?
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4 points
50% Rr and 50% rr
50% red and 50% silver black
75% Rr and 25% rr
75 % red and 25 % silver black
The correct answer is 50% red and 50% silver black.
When a heterozygous red fox (Rr) is crossed with a silver-black fox (rr), the possible genotypes of the offspring are:
- 50% Rr: These offspring will be red foxes, as the dominant allele (R) determines the red color.
- 50% rr: These offspring will be silver-black foxes, as they inherit the recessive allele (r) from both parents.
Therefore, the phenotypic percentages will be 50% red and 50% silver black.