Question

Pea plants can have yellow seeds or green seeds. Which conclusion about the meaning of Y is correct if the allele combination Yy is for yellow seeds?
yellow and dominant
green and recessive
yellow and recessive
green and dominant

Answer 1

yellow and dominant

Explanation: the heterozygote (Yy) shows the yellow phenotype, so Y must be the dominant allele producing yellow (y is recessive for green).