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
75% Rr and 25% rr
75 % red and 25 % silver black
50% red and 50% silver black
50% Rr and 50% rr
To determine the phenotypic percentages of the cross between a heterozygous red fox (Rr) and a silver-black fox (rr), you need to consider the possible combinations of alleles.
The possible genotypes of the offspring would be:
- 50% Rr (heterozygous red fox)
- 50% rr (silver-black fox)
Since the dominant allele (R) determines the red color, and the recessive allele (r) determines the silver-black color, the phenotypic percentages would be:
- 50% red fox
- 50% silver-black fox
Therefore, the correct answer is: 50% red and 50% silver black.