Awoman is heterozygous for a rare dominant autosomal genetic disease, neurofibromatosis. she marries a normal man (homozygous recessive for neurofibromatosis), who has red-green color blindness, an x-linked recessive trait. they have children. if the woman is homozygous for normal vision, what is the chance they will have a daughter with color blindness?
a. 100%
b. 50%
c. 0%
d. 25%

Option A

Explanation:

Given -

Man has X-linked recessive trait . Thus its genotype can be represented as

YX'

Woman has normal vision with homozygous genotype i.e "XX"

A cross is carried out between the above two parents thereby producing following offspring -

YX’

XXYXX’

XXYXX’

Out of four offspring two are boy "XY" which do not have Red-Green Color blindness

While the two daughters "XX' " have Red-Green Color blindness

Thus, all the daughters produced have Red-Green Color blindness. Thus the chance of having a daughter with color blindness is 100 percent

Option A

the function of the protein macromolecule is to move things in and out of the cell and transport other molecules in the body. there are many functions of proteins. they are the basic building blocks of living things and are responsible for the growth and repair of body cells and tissues.

explanation: