Haydenbrettidn
Answered

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In pea plants the allele for round seeds (R) is dominant and the allele for wrinkled seeds (r) is recessive. Under what conditions would we observe wrinkled seeds in a pea plant?

A. When the plant has a genotype RR

B. When the plant inherits a dominant allele from both parents

C. When the plant inherits a recessive allele from both parents

D. When a plant has a heterozygous allelic pair of the gene for seed shape

Sagot :

PaullyMacidn

Answer:

C.

Explanation:

Law of Independent Assortment

It was seen in a dihybrid cross involving two independent traits. This law states that “the assortment of one gene occurs independently of the other gene at the time of gametogenesis”.  

Consider a cross between a round and yellow seed pea plant with wrinkled and green seed. Yellow and round seeds are produced in the F1 generation. In the F2 progeny, both parental and new combination of traits appears indicating that the segregation of the seed colour is independent of seed shape. It gives rise to a phenotypic ratio of 9:3:3:1.

A. When the plant has a genotype RR the seed shape is round because "R" allele for the round shape is dominant over "r" for wrinkled seed shape. The "R" allele suppresses/masks the expression of the recessive allele r. Therefore, it is not the correct answer.

B. When the plant inherits a dominant allele from both parents the seed shape is round because "R" allele for the round shape is dominant over "r" for wrinkled seed shape. The "R" allele suppresses/masks the expression of the recessive allele r. Therefore, it is not the correct answer.

C. When the plant inherits a recessive allele from both parents the seed shape is wrinkled. Recessive alleles are expressed in the absence of dominant alleles. Therefore, it is the correct answer.

D. When a plant has a heterozygous allele pair of the gene for seed shape the seed shape is round because "R" allele for the round shape is dominant over "r" for wrinkled seed shape. The "R" allele suppresses/masks the expression of the recessive allele r. Therefore, it is not the correct answer.

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