USE GENETIC TERMINOLOGY In humans, the ABO blood grouping system has three allel

Question

USE GENETIC TERMINOLOGY In humans, the ABO blood grouping system has three alleles (I^A, I^B, and i) and exhibits co -dominance in the AB type: O type blood is the recessive condition. In the Rh factor blood grouping system, there are two alleles (R and r). Rh^+ is completely dominant to Rh^- and the gene for the Rh factor is on a different autosome (non-sex chromosome) than the autosome that contains the ABO gene. Rene has A+ blood - her father is O^- Pierre has type AB+ blood and has a child who is A- Joan is pregnant and Tomas is the father. a. What are the genotypes of Joan and Tomas? USE GENETIC TERMS. b. Show the cross between the Joan and Tomas by constructing a Punnett square. c. List the expected phenotypes of Joan and Tomas's children and the number of each.

Explanation / Answer

since you haven't provide any information about blood groups of Joan and Tomas so I assume that Joan is A+ and Tomas is B+. both are heterozygous.

so the genotype will be-

IA IO and IB IO

now cross-

IB IO

IA IAIB IAIO

IO   IBIO IOIO

expected phenotypes-

A+, B+, AB+ and O+ blood group.

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