Biology Science Notebook
Biology Science Notebook
1st Edition
ISBN: 9780078961014
Author: GLENCOE
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Chapter 11.2, Problem 6MI
Summary Introduction

To determine:

Different phenotypes obtained by crossing the given blood types.

Introduction:

Codominance: It is a condition, in which two alleles are equally dominant. In this condition, the resultant phenotype is the cumulative expression of both the alleles. In human blood grouping, the type A and type B allele are codominant and allele for blood type O is recessive.

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Explanation of Solution

In the human blood group, if the allele for both A and B blood types are present, then the resultant blood type is AB. IN case of homozygosity, the allele will have a single type of blood type, so, if the person is homozygous for allele A, then the blood type will be A, similarly for homozygosity for blood B and O occurs. In case, the allele of A or B blood type is present with recessive allele, then the respective dominant allele (type A or type B) will be expressed.

    Possible Genotype combinationPhenotype
    A and AA
    A and BAB
    A and OA
    B and BB
    B and OB
    O and OO

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