A particular plant has two alleles that control the length of its stem. T represents the dominant allele that codes for a tall stem, and t represents the recessive allele that codes for a short stem. Based on the Punnett squares, which two statements are true about the genotype of the plant's stem length?

First Generation

__t_ t

T Tt Tt

T Tt Tt

Second Generation

__T_ t

T TT Tt

t Tt tt

Select all the correct answers.

A) Plants with short stems are homozygous for that trait.

B) Plants with tall stems are always homozygous for that trait.

C) Both parent plants in the second generation are heterozygous.

D) Both parent plants in the second generation are homozygous.

Question

Biology

Laura Berger

2 June, 12:38

A particular plant has two alleles that control the length of its stem. T represents the dominant allele that codes for a tall stem, and t represents the recessive allele that codes for a short stem. Based on the Punnett squares, which two statements are true about the genotype of the plant's stem length?

First Generation

__t_ t

T Tt Tt

T Tt Tt

Second Generation

__T_ t

T TT Tt

t Tt tt

Select all the correct answers.

A) Plants with short stems are homozygous for that trait.

B) Plants with tall stems are always homozygous for that trait.

C) Both parent plants in the second generation are heterozygous.

D) Both parent plants in the second generation are homozygous.

+2

Answers (2)

Know the Answer?

Gloria Molina · Answer 1

I believe A and C are both correct.

Tori Robbins · Answer 2

The correct answers are options A and C.

The Statement A says that the plants, which have a short stem is homozygous for the trait. According to the question, the allele for the short height is recessive. A recessive trait can only be observed, when the dominant allele is not at all present. Hence, the plant must have tt allele, so, the plant having short stem would be homozygous recessive.

The statement C says that the both parents in second generation are heterozygotes. It is given that the parents in the second generation have aa genotype Tt. In this case, both the alleles are different, hence, the parent plants are heterozygotes.