What is the probability that a child of the parents, whose blood types are AB and B, will have B blood type?

Human Anatomy & Physiology (11th Edition)
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ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
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What is the probability that a child of the parents, whose blood types are AB and
B, will have B blood type?
Transcribed Image Text:What is the probability that a child of the parents, whose blood types are AB and B, will have B blood type?
Expert Solution
Introduction

ABO blood grouping system is the most common type of blood grouping system used. It was discovered by Karl Landsteiner. 

Biology homework question answer, step 1, image 1

Therefore, ABO blood grouping has 6 genotypes and 4 phenotypes

iA and iB dominant over i. i is only expressed when in recessive conditions. When iA and iB are present together, they show codominance.

 

Solution

The parents have blood type AB and B. 

There are two possible genotypes for the parent with the B blood group. Therefore there will be two separate crosses. 

Cross 1: 

iAiB  x   iBi

Biology homework question answer, step 2, image 1

Probability of having a child with blood group B = 1/2 

Cross 2: 

iAiB x iBiB 

Biology homework question answer, step 2, image 2

Probability of having a child with blood group B = 1/2

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