Question

in peas, yellow seed color (y) is dominant to green seed color (y). which describes an organism that has nonidentical alleles for seed color?
○ yy and has green seeds
○ yy and has yellow seeds
○ yy and has yellow seeds
○ yy and has green seeds

Explanation:

1. First, understand allele types: Nonidentical alleles mean a heterozygous genotype (different alleles, like Yy). Identical alleles are homozygous (YY or yy).
2. Analyze seed color: Yellow (Y) is dominant over green (y). So:

• yy: homozygous recessive, green seeds (identical alleles, eliminate).
• Yy: heterozygous (nonidentical alleles). Since Y is dominant, phenotype is yellow seeds.
• YY: homozygous dominant, yellow seeds (identical alleles, eliminate).
• Yy with green seeds: Impossible, as Y is dominant (Y y gives yellow, eliminate).

Answer:

B. Yy and has yellow seeds