Question

If two giraffes were crossed, where one is heterozygous for albinism (a) and the other has a homozygous dominant genotype, what would be the expected possible genotypes?

Answer 1

AA and Aa

Step-by-step explanation:

Heterozygous means that the organism has the two alleles for a specific trait, and the opposite is homozygous means has the same alleles for a specific trait.

Now heterozygous for albinism (a), so this means that the genotype of this giraffe in particular would be Aa. Next we have a homozygous dominant genotype for the other giraffe, so it would have the same alleles for this trait, but since it specifically says DOMINANT, the genotype would be two capital letters, or AA.

Now let's do the cross. First we write the gametes of the parents at the side of the Punnett square and let's cross them.

Aa x AA

A a

A AA Aa

A AA Aa

So according to this, the possible genotypes would be AA and Aa.