12. A child has hitchhiker's thumb. His mother and father do not. What is the correct
genotypic ratio for a cross between these parents? Hitchhiker's thumb is recessive.
O 1:1:1:1
01:2:1
O 3:1
O 4:0
1:2:1 because the father and mother are both heterozygous. plug the allele big H and small h for both parents in the punnett square and you'll get 1:2:1