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Item CA033003: The DNA sequence of similar genes in different organisms can differ at certain locations because of mutations that occur in those genes.

Dogs, pigs, and cats have similar genes for traits that they have in common, such as four legs, tails, and a rib cage. One of those genes, Gene X, is pictured above. Why does the DNA sequence of Gene X differ in some positions (highlighted in red) for dogs, pigs, and cats?

  1. Over time, the organisms’ traits changed, which caused Gene X to change.
  2. Over time, mutations occurred in Gene X.
  3. All three organisms had different needs, so they intentionally created different genes.
  4. Not enough information is given.
Distribution of Responses
Chart showing distrubtion of responses for Item 033003
Points Earned
Group Correct Total Percent
Overall 181 580 31%
Grades
  6–8 8 25 32%
  9–12 160 514 31%
Gender
  Male8625434%
  Female8528630%
Primary Language
  English16552631%
  Other21315%

View data table

Distribution of Responses
Chart showing distrubtion of responses for Item 033003
Points Earned
Group Correct Total Percent
Overall 108 255 42%
Grades
  6–8 10 15 67%
  9–12 77 195 39%
Gender
  Male469747%
  Female4311936%
Primary Language
  English8620542%
  Other1617%

View data table

Distribution of Responses
Chart showing distrubtion of responses for Item 033003
Points Earned
Group Correct Total Percent
Overall 156 301 52%
Grades
  6–8 6 8 75%
  9–12 139 274 51%
Gender
  Male6813451%
  Female8015053%
Primary Language
  English14227452%
  Other3933%

View data table