genetics

2. change over time
4. Process by which a single parent reproduces by itself
5. Nutrients the body uses to build and maintain its cells and tissues
8. An organism that has two different alleles for a trait
10. a random error in gene replication that leads to a change
12. Passing of traits from parents to offspring
13. genetic makeup of an organism
14. Cell division that produces reproductive cells in sexually reproducing organisms
16. A form of asexual reproduction of yeast in which a new cell grows out of the body of a parent.
17. Describes a trait that covers over, or dominates, another form of that trait.
20. A diagram that shows the occurrence of a genetic trait in several generations of a family.

1. Any difference between individuals of the same species.
3. threadlike structures made of DNA molecules that contain the genes
6. DNA segments that serve as the key functional units in hereditary transmission.
7. An organism that has two identical alleles for a trait
9. cell division in which the nucleus divides into nuclei containing the same number of chromosomes
11. Product of reproduction, a new organism produced by one or more parents
15. A form of asexual reproduction in single-celled organisms by which one cell divides into two cells of the same size
18. A characteristic that an organism can pass on to its offspring through its genes.
19. different forms of a gene