AP BIOLOGY

Detailed explanation-1: -Approximately 100 offspring would be expected to be homo-zygous dominant (Option D).

Detailed explanation-2: -In guinea pigs, black fur (B) is dominant over white fur (b) and rough four ( R ) is domiant over smooth fur ( r ) . A cross between two Guinea pigs hybrid for both traits (BbRr x BbRr) produces some offsprings that have rough, black fur and some that have somooth, black fur.

Detailed explanation-3: -In guinea pigs, the allele for black coat color (B) is dominant over the allele for white coat color (b). In an ideal mouse population exhibiting Hardy-Weinberg equilibrium of 31 guinea pigs, 2 are homozygous dominant, 11 are heterozygous, and 18 are homozygous recessive.

Detailed explanation-4: -The dominant color in mice from black and white is black. The recessive gene in the black mice is in codominant and incomplete dominance with the white allele. However, the black mice have different recessive genes.

Detailed explanation-5: -Complete answer: The probability that a white mouse that is homozygous for long fur and a mouse heterozygous for both traits can have an offspring with short white fur is 0. Let us understand this by analysing the genes responsible for the traits and how they are inherited by the progeny.