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Massachusetts Comprehensive Assessment System


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MCAS QUESTION OF THE DAY:

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2012 Spring Release, Biology - High School
Download PDF Document Question 7 - Multiple-Choice

Reporting Category: Genetics
Standard: 3.3 - Explain how mutations in the DNA sequence of a gene may or may not result in phenotypic change in an organism. Explain how mutations in gametes may result in phenotypic changes in offspring.

 
The table below presents a variety of mRNA three-base sequences (codons) and the amino acids for which these sequences code.
First Base
of mRNA
Second Base
of mRNA
Third Base
of mRNA
Amino Acid
GAAglutamic acid
Caspartic acid
Gglutamic acid
Uaspartic acid
GAglycine
Cglycine
Gglycine
Uglycine
UAvaline
Cvaline
Gvaline
Uvaline
Based on the information in the table, which of the following changes is least likely to produce a phenotypic change in an organism?
 
 
 

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Last Updated: August 14, 2017
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