Question

Two plants differ in the seed color they produce. One plant produces green seeds, the other produces yellow seeds. Yellow is the dominant phenotype. If the parental plants are true-breeding, what would the resulting F1 offspring's genotype be?

Answer 1

Answer:

Genotype: 100% or 4/4 of the progeny will be heterozygous for the trait, Yy.

Explanation:

Available data:

• Two plants differ in the seed color they produce.
• One plant produces green seeds, the other produces yellow seeds.
• Yellow is the dominant phenotype, over green which is the recessive phenotype
• The parental plants are true-breeding

Let us say that the allele Y expresses yellow color and is dominant over the allele y which expresses the green color and in the recessive one.

Cross: a green-seeded plant with a yellow-seeded plant

Parental)                 YY             x             yy

Phenotype)   Yellow seeds            Green seeds

Gametes)           Y      Y                        y        y

Punnet square)      Y            Y

                     y       Yy            Yy

                     y        Yy            Yy

F1) Phenotype: 100% of the progeny will be yellow-seeded

  Genotype: 100% or 4/4 of the progeny will be heterozygous for the trait