Question

if the male parent cell is heterozygous for a trait, Tt, what alleles could the sperm cells possibly have?

Answer 1

T or t
If the female has the same heterozygous trait, which would be t, the baby has a 25% chance to get tt.
50% chance to get Tt, and carry it further.
and also 25% to get TT, and don't carry the trait.