Type the correct answer in the box. Use numerals instead of words. A recessive gene located on the X chromosome is the cause of one type of colorblindness (denoted by X^c). Let the genotype for normal vision be
denoted by X^+.
Suppose a mother with normal vision (X^+X^c) and a father with normal vision (X^+Y) reproduce. Their child's possible genotypes can be illustrated
with the following Punnett square.

If they have a son, his chance of having this type of colorblindness is [ Blank ] %.

doctors i believe if i'm wrong sorry

"1. it should be, it has been for about 20 years, and it's really not much different in the end than breeding animals to have particular traits. there are always concerns about genetically engineered animals/plants affecting the environment in unexpected negative ways, but i can't think of an example where the fears didn't turn out to be baseless.  

first, as you point out, it would be a great advance in pharmacology, to be able to tailor drugs and their doses to me. the pros involve better medical treatment. the cons involve privacy issues like insurance companies denying coverage to people with genetic risk factors. looking at dna markers wouldn't affect the frequency of genetic diseases, but it would allow detection of them earlier. and ok, actually i suppose that if people used this information to avoid having children with genetic diseases, some might decrease in frequency."