Justin has type A blood and his wife Brittany has type B blood. Justin's parents both have type AB blood, and Brittany's parents also both have type AB blood. What are the chances that Justin and Brittany's son Theodore has type A blood?a) 100%b) 75%c) 25%d) 0%

Option D

Explanation:

Given

Justin has type A blood . Both the parents of Justin has AB blood type

Brittany has type B blood and both the parents of Brittany has AB blood type

This make it clear that -

Genotype of Justin is AA

Genotype of  Brittany is BB

Now if Justin is crossed with Brittany , following blood groups in offspring is possible -

AA * BB

AB, AB, AB, AB

Thus, none of the offspring will have A blood group. Thus the chances that Justin and Brittany's son has type A blood is %

Option D is correct

"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."