In a cross Aa x Aa, the fraction of offspring that are recessive homozygous aa?

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Multiple Choice

In a cross Aa x Aa, the fraction of offspring that are recessive homozygous aa?

Explanation:
When two Aa parents mate, each offspring can inherit either A or a from each parent, yielding four equally likely genotype combinations: AA, Aa, Aa, and aa. The recessive homozygous genotype is the aa outcome, which occurs in only one of the four possibilities. So, the fraction of offspring that are recessive homozygous is one out of four, i.e., about twenty-five percent. This also reflects the 1:2:1 genotype ratio for a monohybrid cross with complete dominance.

When two Aa parents mate, each offspring can inherit either A or a from each parent, yielding four equally likely genotype combinations: AA, Aa, Aa, and aa. The recessive homozygous genotype is the aa outcome, which occurs in only one of the four possibilities. So, the fraction of offspring that are recessive homozygous is one out of four, i.e., about twenty-five percent. This also reflects the 1:2:1 genotype ratio for a monohybrid cross with complete dominance.

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