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In pea plants, yellow seeds are dominant over green seeds. What would be the expected genotypic ratio in a cross between a plant with green seeds and a plant that is heterozygous for yellow seed color?


0YY :2Yy :2yy


3YY: 1yy


2YY :2Yy :0yy


1YY: 2Yy: 1yy

In pea plants, yellow seeds are dominant over green seeds. What would be the expected genotypic ratio in a cross between a plant with green seeds and a plant th class=

Answer :

marianaegarciaperedo

Assuming a diallelic gene that expresses complete dominance,  the expected genotypic ratio is  0YY : 2Yy : 2yy. Option A is correct.

Available data.

  • Yellow seeds aredominant over green seeds
  • Y is the dominant allele
  • y is the recessive allele
  • Cross: between a plant with green seeds and a plant that is heterozygous for yellow seed color

According to this, and assuming complete dominance, we can propose the following genotypes and phenotypes.

  Genotype     Phenotype  

   YY, Yy         Yellow seeds

       yy             Green seeds  

Parentals)   yy    x    Yy

Gametes)  y    y        Y     y

Punnett square)    Y         y

                    y       Yy       yy

                    y        Yy      yy

F1) Genotypes

2/4 = 1/2 = 50% of the progeny is expected to be heter0zyg0us, Yy

2/4 = 1/2 = 50% of the progeny is expected to be h0m0zyg0us recessive, yy

   Phenotypes

2/4 = 1/2 = 50% of the progeny is expected to have yellow seeds

2/4 = 1/2 = 50% of the progeny is expected to have green seeds.

The expected genotypic ratio is  0YY : 2Yy : 2yy.

You can learn more about crosses involving one diallelic gene at

https://brainly.com/question/12998393

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https://brainly.com/question/1185199

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