If a homozygous black haired guinea pig (BB) is crossed with and homozygous white haired guinea pig (bb), what is the probability that an offspring will have black fur?
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4 points
100%
25%
75%
50%
The genotype of the black-haired guinea pig is homozygous for black hair (BB), and the genotype of the white-haired guinea pig is homozygous for white hair (bb).
When these two guinea pigs are crossed, their offspring will receive one allele from each parent. The possible combinations are:
1. Offspring receives the black hair allele from the black-haired guinea pig (Bb).
2. Offspring receives the white hair allele from the white-haired guinea pig (bB).
Since the letter B represents the black hair allele, and b represents the white hair allele, both combinations result in the offspring having black hair (Bb).
Therefore, the probability that an offspring will have black fur is 100%.