Across
- 3. are the preserved remains, or traces of remains, of ancient organisms.
- 7. How reproductively successful and organism is in its environment.
- 9. A heritable trait that increases an individual’s fitness.
- 10. Formation of new and distinct species in the course of evolution.
- 13. Structures that have no apparent function and appear to be residual parts from a past ancestor.
- 14. Mechanical isolation includes any physical barrier that prevents mating.
- 16. The process of traits that benefit and organisms chance for survival and reproduction are passed more frequently to the next generation.
- 17. The separation of two populations of the same species or breeding group by a physical barrier, such as a mountain or body of water.
- 19. occurs when mismatches in mating traits (signals and/or preferences) prevent mating between two species/populations.
- 21. features of different species that are similar in function but not necessarily in structure and which do not derive from a common ancestral feature
Down
- 1. similar physical features in organisms that share a common ancestor, but the features serve completely different functions.
- 2. the process of selected conducted under human direction.
- 4. organisms best adjusted to their environment that are most successful in surviving and reproducing
- 5. A premating (prezygotic) isolating mechanism in which members of different species seldom, if ever, meet because each species prefers to live (is adapted to) different habitats.
- 6. the process in which two or more populations of an ancestral species accumulate independent genetic changes (mutations) through time
- 8. biological evolution that occurs by chance
- 11. The disappearance of species from Earth
- 12. occurs when two populations differ in their periods of activity or reproductive
- 15. change in DNA
- 18. a change over time
- 20. A sequence of DNA that codes for a particular trait.