Across
- 4. a fossil that is only found at one time in history
- 5. a theory that states that organisms that inherit traits that are better suited to their environment are more likely to live long enough to reproduce and pass on their genetics; causes evolution or extinction
- 6. a change that happens in a population over time; causes adaptations
- 7. the type of the allele that is coded for over other alleles
- 8. the type of allele that is only coded for in the absence of dominant alleles
- 10. differences in organisms that exist because they inherited different alleles
- 12. special molecules that come together in different sequences to make the genetic code of organisms
- 14. reproduction that occurs when two parents create an offspring that is a genetic mix of both parents
- 16. the process of replicating and passing on genetics to offspring
- 18. a change in an organism
- 19. the genetic make up of an organism
- 20. the breeding of two organisms that contain desirable traits
- 24. structures found in the nucleus made of many strands of coiled DNA
- 25. a sequence of DNA that codes for a specific trait
Down
- 1. the altering of an organisms DNA in a laboratory setting
- 2. anything that restricts the growth of an organism or the abundance of a population; these cause natural selection
- 3. a method of telling how old a fossil is in years
- 9. a method of telling how old a fossil is compared to other fossils
- 11. reproduction that occurs when one parent creates offspring that is a genetic clone of themselves
- 13. a law that states that newest rocks and fossils on will be on top and the older rocks and fossils will be on bottom
- 15. pairs of chromosomes that code for the same trait; one comes from each parent
- 17. the eradication of an entire species
- 21. the study of inherited characteristics
- 22. the physical traits of an organism
- 23. any remain or impression from something that used to be living