Evolution and Natural Selection

12345678910111213141516171819
Across
  1. 3. something an animal does usually in response to some type of external stimulus in order to survive
  2. 11. smallest unit that can live on its own and that makes up all living organisms and the tissues of the body
  3. 13. any movement of individuals, and/or the genetic material they carry, from one population to another
  4. 15. the complete disappearance of a species from Earth
  5. 16. the change in heritable traits of biological populations over successive generations
  6. 17. similar structures that evolved from a common ancestor
  7. 18. when a group within a species separates from other members of its species and develops its own unique characteristics
  8. 19. an infectious microbe consisting of a segment of nucleic acid surrounded by a protein coat
Down
  1. 1. organisms whose cells contain a nucleus and other membrane bound organelles
  2. 2. one parent copies itself to form a genetically identical offspring
  3. 4. happens when germs like bacteria and fungi develop the ability to defeat the drugs designed to kill them
  4. 5. type of structural modification made to a part of the body
  5. 6. an organism combines the genetic information from each of its parents and is genetically unique
  6. 7. the reduction in genomic variability that occurs when a small group of individuals becomes separated from a larger population
  7. 8. organisms whose cells lack a nucleus and other organelles
  8. 9. different organisms vary in how they look and function because they have different inherited information
  9. 10. one of two or more versions of DNA sequence at a given genomic location
  10. 12. asexual reproduction by a separation of the body into two new bodies
  11. 13. the change in frequency of an existing gene variant in the population due to random chance
  12. 14. a large group of single cell microorganisms