Across
- 2. choosing parents with particular characteristics to breed together and produce offspring with more desirable characteristics.
- 7. occurs when the sperm from the male parent fertilizes an egg from the female parent, producing an offspring
- 9. A large group of single-cell microorganisms. Bottleneck Effect
- 10. Effect the loss of genetic variation that occurs after outside forces destroy most of a population.
- 12. cases where two (or more) species reciprocally affect each other's evolution.
- 13. a branch of science that is related to the formation, growth, and development of embryo
- 15. involves one parent and produces offspring that are genetically identical to each other and to the parent. Asexual Reproduction
- 16. the complete disappearance of a species from Earth.
- 17. the change in frequency of an existing gene variant in the population
- 18. type of structural modification made to a part of the body
- 20. Evidence the evidence of bacteria, animals, and plants that lived in the past
Down
- 1. a modification of an organism or its parts that makes it more fit for existence
- 3. something an animal does usually in response to some type of external stimulus in order to survive Behavioral Adaptation
- 4. occurs when a small group of individuals becomes separated from a larger population.
- 5. those from organisms that share a common ancestor.
- 6. a mechanism of evolution
- 8. the transfer of genetic material from one population to another. Gene Flow
- 11. organisms whose cells lack a nucleus and other organelles
- 14. Different organisms that have different inherited information.
- 19. One of two or more DNA sequences occurring at a particular gene locus Homologous Structure