Question

9. A woman with type A blood and a man with type o blood have three children. One has type B, one has type AB, and one has type A blood. a. (5 points) Based on this information, fill in all possible genotypes for the family members. Family member Phenotype possible genotype(s) Mother Type A Father Type o Child 1 Type B Child 2 | Type AB Child 3 Type A (3 points) The mother needs a transfusion of red blood cells (not plasma). Which of these family members could safely provide red blood cells for her? 10. You are breeding beetles, which can either have a hard shell or a soft shell. Although hard shell beetles breed true, soft-shell beetles do not. You cross together soft shell beetles and obtain the resulting F1 progeny: 663 soft shell beetles 337 hard shell beetles a. (4 points) Propose a complete genetic model to explain these results (incl., genes, alleles, allelic relationships, etc.) Page 5 of 13 b. (4 points) Using your genetic model, list the gametes produced by the hard shell beetles and the gametes produced by the soft shell beetles from the F1 progeny. If you were to cross the hard shell and soft shell F1 beetles, what phenotypic ratio would you expect in the F2 generation?

Answer 1

Ans) The genotype for A blood group is represented by IAIA  or IAi and genotype for O blood group is represented by ii .

I have attached the detailed solution below in the form of an image :

Ans b) The mother with blood type A can receive blood from Father and Child 3 i.e from blood type O and A respectively because in blood type A , the A antigen is present on the RBC and Anti-B antibodies are produced. So, Blood type B will not work because blood type B RBCs have B antigen which can react with the Anti-B antibodies in the mothers blood.Similarly, AB blood type will also not work because it has A and B antigens on the RBCs. Wheras Blood type A has A antigen which will not react with Anti-B antibodies in the mother's blood.Blood type O has no antigens present on the RBC and thus, blood Type O is considered as universal donor.