Question

4.
If the offspring of a dihybrid cross have a 9:3:3:1 phenotypic ratio, what must be true of the parents’ genotypes?

Both parents are heterozygous for only one trait.

Both parents express the dominant trait.

Both parents express the recessive trait.

Both parents are heterozygous for both traits.

Answer 1

D is the correct answer

Answer 2

Both parents are heterozygous for both traits.

What is a heterozygous example?

Being heterozygous for hair color could mean you have one allele for red hair and one allele for brown hair.

What is heterozygous vs homozygous?

Being homozygous for a particular gene means you inherited two identical versions. It's the opposite of a heterozygous genotype, where the alleles are different.

Hence , D is correct option

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