Question

Consider an individual with red-green color deficiency.What is the minimum possible number of the child's GRANDPARENTS who were also red-greencolor deficient?*note* Please enter numbers only - (0-4)What must be the genotype of a couple that has a 100% chance of producing offspring that areheterozygous for the PT taster gene?

Answer 1

It is not necessary to have a grandparent with this condition (0 grandparents). But it is mandatory that the parents are heterozyogtes. (and highly probable that grandparents has the c allele) Since we require to have two recessive alleles to develop this condition, this has low chances. So, consider this:

Grandfather C- <---> Grandmother C- (C- refers to either Cc or CC)

Father C- <---> Mother C-

Child cc. ---> As long as the grandparents and parents carry a -c- allele, and most important, inherit it, the child could have real chances of developing the condition.