Genetic Analysis: An Integrated Approach (3rd Edition)
Genetic Analysis: An Integrated Approach (3rd Edition)
3rd Edition
ISBN: 9780134605173
Author: Mark F. Sanders, John L. Bowman
Publisher: PEARSON
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Chapter 4, Problem 9P
Summary Introduction

To analyze:

The ABO, Rhesus (Rh) and MN blood group systems.

Determination of the following aspects from the given information:

a. The genotypes for a child with a blood group – A, Rh-, M

Woman – O, Rh-, MN

Man – A, Rh+, M.

b. The proportion of children born to a man with genotype IAIB Rr MN and woman with IAi Rr NN will have blood types B Rh- MN.

c. Paternity of a child having blood group O Rh- MN with a man having blood group B Rh+ N, a woman with A Rh+ MN.

Introduction:

A) ABO blood group system- The human blood group system is classified using antigens present on the RBC's (Red blood cells or erythrocyte). ABO blood types were revealed by the Austrian physician Karl Landsteiner (1901). ABO blood group is characterized under multiple alleles that show three or more alternative forms of a gene present on the same locus.

B) Rh blood group system:

Rhesus factor or Rhesus antigen is another isoantigen of RBC. It is the second most blood group system after ABO blood group system. The “Rh” factor is first described in Rhesus monkeys. The expression of Rh factors is denoted in Rh+ - expressed (antigen present), Rh- - deletion of the protein leads to the suppression of antigen (absence of antigen). The Rh factor is crucial during transfusion of blood from a donor to a recipient.

If the donor's Rh factor does not match with that of the recipient, it will lead to a transfusion reaction that causes hemolytic anemia. During pregnancy, Rh factor testing is very essential.

- Rh + can accept the donation of either Rh+ or Rh-.

- Rh- can only accept Rh- blood, or it will agglutinate.

C) MN blood group system-

MN blood group is discovered by Landsteiner and Levine. The MN Blood groups genes are closely linked genes present on chromosome 4. The alleles M and N show co-dominance that can have both phenotypes (MM, MN, NN).

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Students have asked these similar questions
A woman who has blood type A positive has a daughter who is type O positive and a son who is type B negative. Rh positive is a trait that shows simple dominance over Rh negative and is designated by the alleles R and r, respectively. A third gene for the MN blood group has codominant alleles M and N. If both children are of blood type M in addition to their ABO blood type, list all of the possible parental phenotypes for the ABO, MN and Rh traits.
What would the offspring's blood type be if the mother is type O+ (she is homozygous for Rh factor) and the father is A- (he is homozygous for type A)? Hint: You have to do two Punnett squares. The two Punnett squares must be shown to get the full points. After doing the Punnett squares, write down the possibilities of the offspring’s blood type.
The mother of a family with 10 children has blood typeRh+. She also has a very rare condition (elliptocytosis,phenotype E) that causes red blood cells to be oval rather than round in shape but that produces no adverseclinical effects. The father is Rh− (lacks the Rh+ antigen)and has normal red blood cells (phenotype e). The children are 1 Rh+ e, 4 Rh+ E, and 5 Rh− e. Information isavailable on the mother’s parents, who are Rh+ E andRh− e. One of the 10 children (who is Rh+ E) marriessomeone who is Rh+ e, and they have an Rh+ E child.a. Draw the pedigree of this whole family.b. Is the pedigree in agreement with the hypothesisthat the Rh+ allele is dominant and Rh− is recessive?c. What is the mechanism of transmission ofelliptocytosis?d. Could the genes governing the E and Rh phenotypesbe on the same chromosome? If so, estimate the mapdistance between them, and comment on your result

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Genetic Analysis: An Integrated Approach (3rd Edition)

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