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In pea plants, yellow seeds (y) are dominant and green seeds (y) are recessive. a pea plant with yellow seeds is crossed with a pea plant with green seeds. the resulting offspring have about equal numbers of yellow and green seeded plants. what are the genotypes of the parents?

Respuesta :

mathmate
To get the result of having 50% of recessive phenotype (green seeds), it is necessary to have a homozygous recessive parent (yy) crossed with a heterozygous parent (Yy) in order to achieve the 50% Yy (yellow, dominant) and 50% (yy, green, recessive).

The Punnett square below illustrates the above result:
         y    y
Y     Yy  Yy
y      yy   yy

So we get 50% Yy(heterogous, yellow dominant) and 50% yy (homozygous recessive, green).