Across
- 4. Type of speciation that occurs when two populations are still within the same area
- 6. Transfer of traits from parent to offspring via genes
- 8. Trait that helps individuals survive changing environments
- 10. Type of structure where body parts are similar due to shared common ancestry
- 12. Type of structure where body parts are similar due to similar selective pressures rather than shared ancestry
- 14. Type of selection where nature is doing the selecting based on fitness in a certain environment
- 15. Type of barrier that prevents reproduction before the zygote can be formed
- 16. Type of barrier that prevents a zygote from successfully reproducing
- 17. Type of speciation that occurs when two populations are separated by physical barriers
Down
- 1. Inability of a species to breed successfully with a related species due to geographical, behavioral, or genetic differences
- 2. Type of selection where humans are doing the selecting based on desired traits
- 3. Study of early pre-birth development of an organism
- 5. Trait differences in a population, which are regulated by genes or environmental factors
- 7. Change in gene frequency in a population over time
- 9. Explanation for observations of the natural world that has been constructed using the scientific method and is supported by extensive evidence
- 11. Sterile offspring that is a cross between two different species
- 13. External agents that affect an organism's ability to survive in a given environment (2 words)