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Blood Types Are Determined by Cell-Surface Antigens Assume that a single gene having alleles that show complete-dominance relationships at the phenotypic level controls the Rh character. An Rh + father and an Rh − mother have eight boys and eight girls, all Rh + . a. What are the Rh genotypes of the parents? b. Should they have been concerned about hemolytic disease of the newborn?

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Human Heredity: Principles and Iss...

11th Edition
Michael Cummings
Publisher: Cengage Learning
ISBN: 9781305251052

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Chapter
Section
BuyFindarrow_forward

Human Heredity: Principles and Iss...

11th Edition
Michael Cummings
Publisher: Cengage Learning
ISBN: 9781305251052
Chapter 17, Problem 19QP
Textbook Problem

Blood Types Are Determined by Cell-Surface Antigens

Assume that a single gene having alleles that show complete-dominance relationships at the phenotypic level controls the Rh character. An Rh+ father and an Rhmother have eight boys and eight girls, all Rh+.

  1. a. What are the Rh genotypes of the parents?
  2. b. Should they have been concerned about hemolytic disease of the newborn?

a.

Summary Introduction

To determine: The genotypes of the parent when all their children have Rh+ blood group.

Introduction: There are two types of Rh blood groups: Rh+ (have Rh antigen) and Rh- (do not have Rh antigen). Rh factor is a point of concern when the mother has Rh- and fetus has Rh+ blood group. This condition can cause hemolytic disease of newborn baby (HDN).

Explanation of Solution

According to the information given in the question, the single allele of a gene that controls the Rh character shows the complete dominance. In this case, the mother is Rh- and the father is Rh+. They have eight girls and eight boys with Rh+ blood type. This indicates that the genotype of father would be Rh+Rh+ and the genotype of mother would be Rh-Rh-...

b.

Summary Introduction

To determine: Whether the parents in the given case should be concerned about the risk of the occurrence of hemolytic disease to the newborn.

Introduction: There are two types of Rh blood groups: Rh+ (have Rh antigen) and Rh- (do not have Rh antigen). Rh factor is a point of concern when the mother has Rh- and fetus has Rh+ blood group. This condition can cause hemolytic disease of newborn baby (HDN).

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