Across
- 3. describes how organisms change over many generations
- 7. process of sperm and egg uniting
- 8. a person, plant, or animal that is descended from a particular ancestor
- 9. differences in offspring caused by different combinations of alleles from two parents
Down
- 1. reproduction involving two parents
- 2. haploid cell such as an egg or sperm
- 4. fertilized egg
- 5. having variation
- 6. an early type of animal or plant from which others have evolved
- 10. group of genetically related organisms constituting a single step in the line of descent