Anatomy and Evolution

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Across
  1. 5. a shared ancestor of two or more species.
  2. 8. a genetically determined characteristic.
  3. 9. an allele that will only express itself if found as a pair.
Down
  1. 1. a similar structure found in different species, which is evidence that they shared a common ancestor.
  2. 2. an allele that will always express itself.
  3. 3. variations of a gene.
  4. 4. structures that function similarly, but do not come from a common ancestor.
  5. 6. a random change within a gene.
  6. 7. organisms who are more fit will survive and reproduce.