What would the genotypes of parents have to be for them to have a color-blind daughter?

Answer 1

The daughter's father would have to have been colour blind, and the mother would need the inheritive gene from her father (the mother doesn't nessecarily need to show it, just have a colourblind father) in order for a female to end up actually colourblind. However, it's extremely rare.

Answer 2

the gene for color blindness is more domiantly male

Answer

I am a woman who is red--green colorblind. The trait is carried on the X chromosome. Males receive an X chromosome from their mother and a Y from their father. If the X carries the trait of colorblindness, the male will be colorblind. Females need to receive two defective X chromosomes to be colorblind, one from their father and one from their mother. If a women has only one defective X chromosome, she will be a carrier of the trait. My father was red-green colorblind and so was my mother's father, making my mother a carrier of the trait, although she is not colorblind herself. I have two sisters who are not colorblind, as they each received a non-defective X chromosome from my mother. I knew before my son was born that he would be red-green colorblind, as the X chromosome he received from me carried the trait. My daughter is not colorblind because my husband was not, so she received only one defective X chromosome (she is a carrier of the trait).

Answer 3

It depends on the gender of the offspring and whether the female has the father's color-blindness.

If she has no color-blind gene, then all her children will have full color vision.

If she has the color-blind gene, then all female offspring will have full color vision. Male offspring may be color-blind, depending on which of her 'X' chromosomes is expressed in the gamete.

Answer 4

If the woman is pure normal vision; we can expect 2/4 chances of getting normal vision (boy or girl), 1/4 of having a girl carrying the gene, and 1/4 of having a boy being colorblind... Colorblind gene is on the X chromosome, and men only have one, so they have more chances of having that problem... So 50% normal vision, 25% carrier and 25% colorblind :D

Answer 5

in the punnet square it shows that a decedent like a grandparent could have a trait that a son/daughter doesn't have. for example, a grandma has blond hair, her daughter has brown hair and her son has blond hair because of his grandma.

Answer 6

For a couple to have a color-blind daughter, both parents must carry the recessive gene for color blindness. The mother would need to be a carrier with the genotype X^BX^b, and the father would need to have the genotype X^bY. This gives a 25% chance of their daughter inheriting the X^bX^b genotype and being color-blind.

Answer 7

X of the father's DNA is causing color blindness. only one of the two X from the mother's DNA is causing color blindness.

Answer 8

(As a fact which is related to the question but of not of a theoretical genetic nature: Colorblindness is almost only a male trait!)