The H gene encodes an enzyme that modifies the base carbohydrate to which the A and B antigens attach.  Genotype hh prevents the A and B antigens from attaching.   Which of the genotypes below will result in bloodtype O based on this information? A) IAIA Hh B) IAi hh C) IBiHH D)IBiHh E) None of the options provided

Human Heredity: Principles and Issues (MindTap Course List)
11th Edition
ISBN:9781305251052
Author:Michael Cummings
Publisher:Michael Cummings
Chapter17: Genes And The Immune System
Section: Chapter Questions
Problem 15QP
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The H gene encodes an enzyme that modifies the base carbohydrate to which the A and B antigens attach.  Genotype hh prevents the A and B antigens from attaching.

 

Which of the genotypes below will result in bloodtype O based on this information?

A) IAIA Hh

B) IAi hh

C) IBiHH

D)IBiHh

E) None of the options provided

ABO
locus
JA
A antigen
Terminal
sugar
H
locus
Compound H
B antigen'
H_
Intermediate
O (no A, B
antigen)
ii
hh
О (nо А,В
O (no A,B
antigen)
Conclusion: Genotypes at both the H locus and
the ABO locus determine the ABO blood type.
Transcribed Image Text:ABO locus JA A antigen Terminal sugar H locus Compound H B antigen' H_ Intermediate O (no A, B antigen) ii hh О (nо А,В O (no A,B antigen) Conclusion: Genotypes at both the H locus and the ABO locus determine the ABO blood type.
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