Question

If a corn plant has a genotype of Ttyy, what are the possible genetic combinations that could be present in a single grain of pollen from this plant

Answer 1

The two combinations possible are Ty and ty. The allele Y doesn't exist in it's genotype, it cannot pass on the dominant allele Y, because it can't pass on what it doesn't have.

Answer 2

Ty and ty

Step-by-step explanation:

This corn plant is being observed based on two traits controlled by two different genes (t and y). According to Mendel's law of independent assortment, the alleles of each gene of this corn plant will undergo segregation into gametes independently of one another. Hence, four possible combinations of gametes (present in the pollen) will be produced by this corn plant since it involves two traits/characters i.e. 2^n which n is the number of traits 2^2=4.

Hence, the four possible combinations of gametes that can be produced by a corn plant with Ttyy genotype is Ty, Ty, ty and ty.

Ty and ty are the only two distinct combinations