Item RH006003: If the sex cells in mice contain 20 chromosomes, then the fertilized egg cell of a mouse contains 40 chromosomes.

Sex cells (sperm or egg cells) in mice contain 20 chromosomes. How many chromosomes does the fertilized egg cell of a mouse contain? (A fertilized egg cell is an egg cell that has combined with a sperm cell.)

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

Distribution of Responses

Chart showing distrubtion of responses for Item RH006003

Percent of students responding correctly

Grades 6–853%
Grades 9–1253%
Primary Language is English53%
Primary Language is not English50%

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