A guinea pig with giant muscles is bred with a guinea pig with regular muscles. If muscle size in guinea pigs is INCOMPLETE dominance would these guinea pigs be able to produce a weak muscle guinea pig?

Yes, they would be able to produce weak muscled guinea pigs

Please see details below

Explanation:

This question involves a single gene coding for muscle size in guinea pigs. The allele for giant muscles (G) is incompletely dominant over the allele for regular muscles (R). This means that a third intermediate phenotype (weak muscles) is produced in a heterozygous state.

According to this question, a guinea pig with giant muscles (GG) is bred with a guinea pig with regular muscles (RR). The following gametes will be produced by each parent:

GG - G and G

RR - R and R

Using these gametes in a punnet square (see attached image), the following proportions of offsprings will be produced:

GR, GR, GR, and GR

This shows that all the offsprings (100%) have weak muscles, hence, YES is the answer to this question.

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