11. The inherited material that is responsible for variation in all organisms is DNA, which stands for
12. When a female cell (egg) is penetrated by a male cell (sperm) this occurs
13. Cross-fertilization occurs when a pollen grain
14. To better understand variation; scientists explore the characteristics, which are passed on from generation to generation within a species. Those characteristics that are passed on from generation to generation are
15. This type of characteristic, eye color, is considered to be
16. Although the same species may have the same basic structure, variations exist within the same species. Variations among members of a population are referred to as
17. Biotic and abiotic things interact within the same environment. An example of an abiotic part of an environment is
18. Closely related species have the same genus name, but different species names. This makes for identification based on
19. A single gene is an uninterrupted segment of DNA, which contains coded instructions for the cell. Genes are located in the
20. The chromosome numbers vary from organism to organism. Dogs have 78 chromosomes and cats have 38. The different pairings of chromosomes outlines the blueprints, which are the source of
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