Acertain 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

The answer is; B

If we assume that the allele for black fur is B and that for white fur is b, crossing a homozygous black rabbit with a heterozygous black rabbit, will yield the following results (indicated in the punnet square below);

Genotypically, 50% of the population will be homozygous dominant, while 50% will be heterozygous. However, phenotypically, all offspring will bear black fur because the black fur allele is dominant over the grey allele.

any abiotic or biotic factor in an ecosystem that causes a population's size to slow or decrease is a limiting factor.