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% red and 50% silver black
50% Rr and 50% rr
75 % red and 25 % silver black
75% Rr and 25% rr
The cross between a heterozygous red fox (Rr) and a silver black fox (rr) can be represented as follows:
Rr x rr
To determine the phenotypic percentages, we need to consider the genotypes and their corresponding phenotypes.
Possible genotypes from the cross:
- Rr (red phenotype)
- rr (silver black phenotype)
The genotypic percentage will be:
50% Rr and 50% rr
Since the red color is dominant (R), both the heterozygous red fox (Rr) and the homozygous silver black fox (rr) will have the red phenotype.
Therefore, the phenotypic percentages will be:
50% red and 50% silver black.
So, the correct answer is:
50% red and 50% silver black.