Spinal Muscular Atrophy is an autosomal recessive genetic disorder in the SMN1 gene that leads to muscle deterioration and is often fatal (leads to death) before affected individuals reach adulthood. Carlos is a heterozygote for the gene. What is his genotype and does he have the disease?
a
AA…yes, he only has the dominant alleles
b
Aa…yes, the dominant allele wins
c
aa…no, he only has the recessive alleles
d
Aa…no, but he is a carrier of the disease