Item RH033002: If the skin cells of a mouse each contain 40 chromosomes, the sperm cells of a mouse contain 20 chromosomes.

Like most animals, mice reproduce sexually.  The skin cells of a mouse each contain 40 chromosomes.  How many chromosomes does a sperm cell of a male mouse contain?

  1. 10
  2. 20
  3. 40
  4. 80

Distribution of Responses

Chart showing distrubtion of responses for Item RH033002

Percent of students responding correctly

Overall55%
Grades 6–850%
Grades 9–1261%
Male54%
Female57%
Primary Language is English56%
Primary Language is not English44%

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