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Massachusetts Comprehensive Assessment System

2015, High School Biology

  Question 44: Open-Response  
In a particular plant species, the position of the flowers on the stem is controlled by a gene with two alleles. The allele coding for flowers growing in the middle of the stem (G) is dominant to the allele for flowers growing only at the end of the stem (g).
  1. Using the allele symbols, identify the genotype of a plant that is heterozygous for this trait.
  1. Draw a Punnett square to show the cross of two heterozygous plants.
  1. Using the cross in part (b), explain how heterozygous crosses demonstrate that alleles segregate. Be sure to describe the law of segregation in your answer.
  1. Identify the process that accomplishes segregation of alleles into sex cells.

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 how Mendel’s law of segregation can be observed through patterns of inheritance. The response correctly identifies the heterozygous genotype, provides a correct Punnett square for the cross of two heterozygotes, clearly explains how heterozygous crosses demonstrate the law of segregation, and correctly identifies the process that accomplishes segregation of alleles.
4
3 The response demonstrates a general understanding of how Mendel’s law of segregation can be observed through patterns of inheritance.
2 The response demonstrates a limited understanding of how Mendel’s law of segregation can be observed through patterns of inheritance.
1 The response demonstrates a minimal understanding of how Mendel’s law of segregation can be observed through patterns of inheritance.
0 The 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: Ecology
Question 23: Biochemistry and Cell Biology
Question 32: Anatomy and Physiology
Question 44: Genetics
Question 45: Evolution and Biodiversity

Return to the MCAS 2015 Student Work Directory



Last Updated: April 12, 2016
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