Question

show your work and circle your answer for the questions below.

1. tall pea plants (t) are dominant over short peas (t). cross a pure tall plant with a hybrid plant. what is the chance of having a tall trait appearing in the f1 generation?
2. huntingtons disease (h) is inherited dominantly. cross a man who is heterozygous for huntingtons with a normal woman. what is the chance that their offspring will have huntingtons disease?

Explanation:

Step1: Determine the genotypes

For question 10: A pure - tall plant has genotype \(TT\), and a hybrid plant has genotype \(Tt\).
For question 11: A man heterozygous for Huntington's has genotype \(Hh\), and a normal woman has genotype \(hh\).

Step2: Set up Punnett squares

Question 10

	\(T\)	\(T\)
\(t\)	\(Tt\)	\(Tt\)

The genotypes of the offspring are \(TT\) and \(Tt\). Since \(T\) (tall) is dominant, all \(TT\) and \(Tt\) plants are tall. The probability of tall plants is \(\frac{4}{4}=1\) or \(100\%\)

Question 11

	\(H\)	\(h\)
\(h\)	\(Hh\)	\(hh\)

The genotypes of the offspring are \(Hh\) (affected) and \(hh\) (unaffected). The probability of having Huntington's disease (\(Hh\)) is \(\frac{2}{4}=\frac{1}{2}\) or \(50\%\)

Answer:

1. The chance of having a tall trait in the \(F_1\) generation is \(100\%\)
2. The chance that their offspring will have Huntington's disease is \(50\%\)