Question

question 20 of 26

in pea plants, the allele for tall plants (t) is dominant over the allele for short plants (t). pea plants with the following genotypes are crossed:

\\(tt \times tt\\)

what is the probability that an offspring will have the \\(tt\\) genotype?

a. 0.50
b. 0.00
c. 0.75
d. 0.25

Explanation:

<pre_analysis>
{
"quality": "clear",
"question_count": 1,
"skills_matched": [
"step_cot",
"multiple_choice_formatter",
"explain_then_answer",
"quick"
],
"needs_drawing": false,
"concepts_used": [
"Monohybrid Cross",
"Genotype"
],
"new_concepts": [],
"current_concepts": [
"Monohybrid Cross",
"Genotype",
"Mendelian Genetics"
]
}
</pre_analysis>

<reasoning>

Set up the cross

\[
Tt \times Tt
\]

Determine offspring genotypes

\[

$$\begin{array}{c|cc} & T & t \\ \hline T & TT & Tt \\ t & Tt & tt \\ \end{array}$$

\]

Calculate the probability of TT

\[
P(TT) = \frac{1}{4} = 0.25
\]
</reasoning>

<answer>
<mcq-option>A. 0.50</mcq-option>
<mcq-option>B. 0.00</mcq-option>
<mcq-option>C. 0.75</mcq-option>
<mcq-correct>D. 0.25</mcq-correct>
</answer>

<post_analysis>
{
"subject": "Natural Science",
"question_type": "Multiple Choice",
"knowledge_point": [
"Natural Science",
"Biology",
"Mendelian Genetics"
]
}
</post_analysis>

Answer:

<pre_analysis>
{
"quality": "clear",
"question_count": 1,
"skills_matched": [
"step_cot",
"multiple_choice_formatter",
"explain_then_answer",
"quick"
],
"needs_drawing": false,
"concepts_used": [
"Monohybrid Cross",
"Genotype"
],
"new_concepts": [],
"current_concepts": [
"Monohybrid Cross",
"Genotype",
"Mendelian Genetics"
]
}
</pre_analysis>

<reasoning>

Set up the cross

\[
Tt \times Tt
\]

Determine offspring genotypes

\[

$$\begin{array}{c|cc} & T & t \\ \hline T & TT & Tt \\ t & Tt & tt \\ \end{array}$$

\]

Calculate the probability of TT

\[
P(TT) = \frac{1}{4} = 0.25
\]
</reasoning>

<answer>
<mcq-option>A. 0.50</mcq-option>
<mcq-option>B. 0.00</mcq-option>
<mcq-option>C. 0.75</mcq-option>
<mcq-correct>D. 0.25</mcq-correct>
</answer>

<post_analysis>
{
"subject": "Natural Science",
"question_type": "Multiple Choice",
"knowledge_point": [
"Natural Science",
"Biology",
"Mendelian Genetics"
]
}
</post_analysis>