Question

a plant heterozygous for yellow pod color (yy) is crossed with a plant homozygous for green pod color (yy). which trait is dominant?

• green pod color
• yellow pod color
• they are both recessive.

Explanation:

In genetics, a dominant allele is represented by a capital letter (here, Y for yellow) and a recessive allele by a lowercase letter (y for green). The heterozygous plant has Yy (yellow allele and green allele), and it shows yellow pod color. A dominant trait is expressed when at least one dominant allele is present. Since the heterozygous (Yy) plant shows yellow pod color, yellow pod color (represented by Y) is dominant over green (represented by y, recessive). Green pod color (yy) is recessive as it's expressed only in homozygous recessive state. Also, the option "They are both recessive" is incorrect as yellow is expressed in heterozygous, so it can't be recessive.

Answer:

yellow pod color