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Massachusetts Comprehensive Assessment System



MCAS QUESTION OF THE DAY:

line
2007 Spring Release, Biology - High School
Question 20 - Multiple-Choice

Reporting Category: Genetics
Standard: 3.6 - Use a Punnett Square to determine the probabilities for genotype and phenotype combinations in monohybrid crosses.

 

Human blood types are genetically
determined. The table below shows
the symbols used to represent two of
the alleles for blood types and gives a
description of each allele.

alleles human blood types

In homozygous individuals, two IA
alleles result in blood type A and
two IB alleles result in blood type B.
The IA and IB alleles are codominant,
resulting in blood type AB in individuals
heterozygous for the two alleles.

A male and a female both have blood
type AB. If they have a child, what is
the probability that the child will also
have blood type AB?

 
 
 

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last updated: January 31, 2012
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