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In pea plants, green pods are dominant to yellow pods and round seeds are dominant to wrinkled seeds. What phenotype ratio will be present among the offipring of a parent that has yellow pods and wrinkled seeds and a parent that is heterozygous for green pods and has wrinkled seeds?
A) 1:1:1:1
B) 9:3:3:1
C) 1:1
D) 3:1
E) 9:7

Respuesta :

Answer:

Option C

Possible phenotype Is  

a) Green and wrinkled – Ggrr

b) Yellow and wrinkled –ggrr

Phenotypic ratio is 1:1

Explanation:

Let the allele for green color of pods be "G" and allele for yellow color of pod

Let the allele for round seeds be "R" and the allele for wrinkled seed be "r"

Genotype of parent that has yellow pods and wrinkled seeds - ggrr

Genotype of parent that is heterozygous for green pods and has wrinkled seeds- Ggrr

Also, green pods are dominant to yellow pods and round seeds are dominant to wrinkled seeds

The cross between ggrr and Ggrr is

Gr          Gr         gr      gr

gr Ggrr Ggrr ggrr       ggrr

gr Ggrr Ggrr ggrr       ggrr

gr Ggrr Ggrr ggrr        ggrr

gr Ggrr Ggrr ggrr        ggrr

Possible genotypes is Ggrr and ggrr

Possible phenotype Is  

a) Green and wrinkled – Ggrr

b) Yellow and wrinkled –ggrr

Phenotypic ratio is 1:1

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