Item RH054001: If the sex cells of a mouse contain 20 chromosomes, then the fertilized egg of a mouse must contain 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?

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

Distribution of Responses

Chart showing distrubtion of responses for Item RH054001

Percent of students responding correctly

Grades 6–845%
Grades 9–1249%
Primary Language is English47%
Primary Language is not English42%

View data table