Having curved or straight thumbs is thought to be a Mendelian trait, and the
straight allele is thought by many geneticists to be dominant. Assuming this is
correct, how would you expect the thumbs of someone with two curved-thumb
alleles to look?
considering the straight allele is dominant then the curved thumb allele must be recessive. so,if someone has two recessive alleles they will express that characteristic. Therefore, the person's thumbs would be curved
