Colorblindness in humans is a recessive X-linked characteristic. A colorblind ma
ID: 72769 • Letter: C
Question
Colorblindness in humans is a recessive X-linked characteristic. A colorblind male mated with a female that is a carrier for colorblindness.
What is the genotype of the male?
_____________________________
What is the genotype of the female?
_____________________________
What are the phenotypes and the ratios of those phenotypes for their possible daughters?
_____________________________
What are the phenotypes of their possible sons?
If you used a Punnett Square, what did it look like/how did you use it?
Explanation / Answer
What is the genotype of the male?
A) Let (Xc) represent the recessive allele that causes colorblindness and (X+) represent the normal dominant allele. Females that are X+X+ or X+Xc have normal color vision, while XcXc females are colorblind. Males that are X+Y have normal color vision, while XcY males are colorblind.
What is the genotype of the female?
A) The genotype of a male with colorblindness is XbY. The genotype of a male with normal vision is XBY. The genotype of a female with colorblindness is XbXb. The genotype of a female who has normal vision but is a carrier of the disease gene is XBXb.
What are the phenotypes and the ratios of those phenotypes for their possible daughters?
A) These phenotypes could vary because of environment effects. Vertical lines indicate the children from the marriage or partnership. He then discovered that in the F2 generation there was a 3:1 ratio between tall and short.
What are the phenotypes of their possible sons?
A) Men always pass the color blind gene to their daughters but the ... And why a color blind mom means that all her sons will be color blind too. ... The genetic term that describes traits like color blindness is “X-linked recessive.” X-linked ... These are the four possible kids in terms of their X and Y chromosomes:.