We're crossing a heterozygous (Yy) and a homozygous recessive (yy). If we picture that in a punnet square:
Y y
y Yy yy → In this punnet square we inserted 3 recessive alleles, because y Yy yy if we add all of the alleles in our cross, we get three; and 1 y dominant allele because in our cross we only have 1 dominant allele.
- We can see that the homozygous recessive comes up two times, which means the recessive trait gains a 50% predominancy (it comes up 2 times out of 4).
Hope it helped,
BioTeacher101
