GENETICS AND EVOLUTION
GENETIC BASIS OF INHERITANCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The ABO blood grouping system has alleles of IA, IB and i. What is this an example of?a) co-dominanceb) multiple allelesc) sex-lingaged) polygenic traits
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only
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and b) only
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and c) only
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and d) only
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Explanation:
Detailed explanation-1: -The ABO blood group antigens are encoded by one genetic locus, the ABO locus, which has three alternative (allelic) forms-A, B, and O. A child receives one of the three alleles from each parent, giving rise to six possible genotypes and four possible blood types (phenotypes).
Detailed explanation-2: -Person having genotype IA, IB would show the blood group as AB.
Detailed explanation-3: -IA, IB both are dominant forms so, person with ii allele have O blood group. Thus people with IAIA or IA i have blood group A and individuals having IBIB or IB i genotype have B blood group.
Detailed explanation-4: -Since IA and IB are codominant over i, there are 4 types of phenotypes possible, i.e. A, B, AB and O.
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