Question

question 12
hair texture is a result of_.
a multifactorial inheritance.
b codominance.
c incomplete dominance.
d a single gene affecting many traits.
e many genes affecting one trait
question 13
a woman has a form of retinitis pigmentosa that is an x - linked dominant trait. her father also suffered from the disease. if her husband does not have the disease, what is the possibility that her daughter will have the disease?
a 0%
b 25%
c 50%
d 75%
e 100%

Explanation:

For Question 12, hair texture is determined by multiple genes and environmental factors, which is multifactorial inheritance. For Question 13, let the allele for the X - linked dominant trait be $X^A$ and the normal allele be $X^a$. The woman has the trait and her father had the trait, so her genotype is $X^AX^a$ (since her father gave her the $X^A$ allele), and her husband's genotype is $X^aY$. For daughters, the possible genotypes from the cross $X^AX^a\times X^aY$ are $X^AX^a$ and $X^aX^a$ with a 50 - 50 chance.

Answer:

Question 12: A. multifactorial inheritance.
Question 13: C. 50%