1 The type of diagram shown is a pedigree chart.

Here are the answers to Question 24: 24.1 The type of diagram shown is a pedigree chart. 24.2 There are 3 alleles that control blood groups (I^A, I^B, and i). 24.3 There are 3 generations represented in the diagram. 24.4 Lina's genotype is I^Ai. Vusi has blood group O. The only possible genotype for blood group O is ii. The possible genotype of Vusi is ii. 24.5 Athi's parents both have blood group O (genotype ii), so Athi's genotype must be ii. Athi (genotype ii) and Bob have a child with blood group B. For this child to have blood group B, they must have received an I^B allele from Bob and an i allele from Athi. So, the child's genotype is I^Bi. Athi (genotype ii) and Bob also have Ann with blood group A. For Ann to have blood group A, she must have received an I^A allele from Bob and an i allele from Athi. So, Ann's genotype is I^Ai. Since Bob must contribute both an I^B allele (for his B-group child) and an I^A allele (for Ann), Bob's genotype must be I^AI^B. The genotype of Bob is I^AI^B. 24.6 Co-dominance in blood groups occurs when both I^A and I^B alleles are expressed, resulting in blood group AB. From 24.5, we determined that Bob's genotype is I^AI^B. The individual which displays co-dominance is Bob. That's 2 down. 3 left today — send the next one.