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Massachusetts Comprehensive Assessment System

2013, High School Biology

  Question 44: Open-Response  
In red-green colorblindness, individuals cannot perceive the colors red and green in the same way as individuals with full color vision. Full color vision is coded by a dominant allele (B) on the X chromosome. Red-green colorblindness is caused by a recessive allele (b) on the X chromosome.
  1. Identify the phenotype of a female with the genotype XBXb.
  2. Identify the phenotype of a male with the genotype XBY.
  3. Draw a Punnett square for the cross X uppercase B, X lowercase b crossed with X uppercase B, Y, and identify the following:
  • the percentage of offspring expected to be male and colorblind
  • the percentage of offspring expected to be female and colorblind
  1. Explain why red-green colorblindness occurs more frequently in males than in females.

Scoring Guide and Sample Student Work
Select a score point in the table below to view the sample student response.

ScoreDescription
4 The response demonstrates a thorough understanding of observed inheritance patterns caused by sex-linked traits. The response correctly identifies the phenotypes of the female and the male. The response provides a valid Punnett square for the given cross and correctly identifies phenotype percentages. The response also clearly explains why red-green colorblindness occurs more frequently in males than in females.
4
3
The response demonstrates a general understanding of observed inheritance patterns caused by sex-linked traits.
2
The response demonstrates a limited understanding of observed inheritance patterns caused by sex-linked traits.
1
The response demonstrates a minimal understanding of observed inheritance patterns caused by sex-linked traits.
0 Response is incorrect or contains some correct work that is irrelevant to the skill or concept being measured.

Note: There are 2 sample student responses for Score Point 4.

High School Biology

Question 12: Evolution and Biodiversity
Question 23: Biochemistry and Cell Biology
Question 32: Anatomy and Physiology
Question 44: Genetics
Question 45: Ecology

Return to the MCAS 2013 Student Work Directory



Last Updated: August 14, 2017
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