In Gregor Mendel's experiments on pea genetics, he determined that yellow seed color, Y, was dominant over green seed color, y. In a cross between two plants, one with yellow seeds and the other with green seeds, all the seeds produced from the offspring were yellow. What was the genotype of the parent plant with yellow seeds?
A) YY
B) Yy
C) yY
D) yy

Question

Quizplus · Accepted Answer

Since all of the offspring had yellow seeds, the parent with yellow seeds must have been homozygous dominant (YY). If it was heterozygous (Yy), there would have been a 50% chance for green seeds in the offspring. If it had been homozygous recessive (yy), all the offspring would have had green seeds.

In Gregor Mendel's Experiments on Pea Genetics, He Determined That