Question

Homozygous tall (TT) pea plants look the same as heterozygous tall (Tt) pea plants. Formulate a pollination experiment to identify whether a tall pea plant is homozygous or heterozygous. Explain your answer in 3-5 sentences.(4 points)

Short Answer Rubric (4 points)
Points Awarded Criteria
4
The answer is very clear.

The answer is fully supported by details.

There may be a few errors in grammar, usage, or mechanics. Errors do not interfere with meaning.

3
The answer is mostly clear.

The answer is supported by mostly relevant details.

There are a few errors in grammar, usage, or mechanics. Errors do not interfere with meaning.

2
The answer is somewhat clear.

Details are weak or not related.

There are some errors in grammar, usage, and mechanics. Errors interfere with meaning.

1
The answer is not clear.

There are few or no supporting details.

There are many errors in grammar, usage, and mechanics. Errors interfere with meaning.

0 The question is not answered.

Answer 1

To determine whether a tall pea plant (T) is homozygous (TT) or heterozygous (Tt), we can perform a test cross by pollinating it with a homozygous short pea plant (tt). If the tall plant is homozygous (TT), all offspring will be tall (Tt). However, if the tall plant is heterozygous (Tt), we would expect a 1:1 ratio of tall (Tt) to short (tt) offspring. By analyzing the phenotype of the progeny, we can clearly identify the genotype of the original tall plant based on the results of the cross.