Answer:
By crossing a yellow squash (YY) with a white squash (yy) , the phenotypic percentage of the offspring is 100% yellow squash (Yy).
Explanation:
The crossing of two pure lines -with identical alleles for a trait- dominant and recessive produces a hybrid or heterozygous offspring, with different alleles for that trait.
In this case, the yellow squash is homozygous dominant, while the white squash is recessive, obviously homozygous.
YY X yy
Alleles Y Y
y Yy Yy
y Yy Yy
All the offspring will have a Yy genotype and a single yellow squash phenotype for 100% of them.
