Red-green color blindness is caused by an X-linked recessive gene. In a family, the mother is a carrier of this gene while the father does not have the gene. What are the possible effects on their children?

Question

Ferredoxin4 · Answer

Are there any options?
If not, here's the cross you must use:

$$XX ^{r}  \times XY$$

If the child is a male, then the male has 50% chance of inheriting RG Color blindness. This is because the child would get the Y allele from his father, then one of the X alleles from his mother.

If the child is a female, then there is no chance of getting RG color blindness, but there is a 50% chance of being a CARRIER of the gene. This is because the father would donate one X allele, and the mother would donate one of hers.

Ferredoxin4 · Answer

The only way to get RG color blindness in this scenario is:
If you are male - 
$$X ^{r}Y$$

You can be a CARRIER (heterozygous) in this scenario:
If you are female
$$XX ^{r}$$

So for males its 50% chance of getting RG color blindness. Females its 0% chance. You can be a carrier though, and that would be 50% chance if you're a female.