When two heterozygous (Rr) parents have an offspring, what is the chance of the offspring having a homozygous recessive (rr) genotype.
a. We cannot tell without first examining the grandparent's DNA.
c. 25%, with a 50% chance of them being heterozygous, and a 25% chance of them being homozygous dominant.
b. There is no chance the offspring will be homozygous recessive with two heterozygous parents.
d. 50%, with a 50% chance of them being heterozygous