In certain rats, black fur is dominant over white fur. If two rats, both heterozygous for fur color are mated, what percentage of their offspring would be expected to have black fur?

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Study for the 9th Grade Biology SOL Test. Prepare with flashcards and multiple choice questions, each featuring hints and explanations. Get ready for your exam!

Multiple Choice

In certain rats, black fur is dominant over white fur. If two rats, both heterozygous for fur color are mated, what percentage of their offspring would be expected to have black fur?

Explanation:
Dominant and recessive alleles determine fur color. If both rats are heterozygous (Bb), each parent can pass B or b. The offspring genotypes are BB, Bb, Bb, and bb. Black fur appears in BB and Bb, which are three of the four possibilities, so three-quarters of the offspring would be black. That’s 75% black fur and 25% white fur.

Dominant and recessive alleles determine fur color. If both rats are heterozygous (Bb), each parent can pass B or b. The offspring genotypes are BB, Bb, Bb, and bb. Black fur appears in BB and Bb, which are three of the four possibilities, so three-quarters of the offspring would be black. That’s 75% black fur and 25% white fur.

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