. Sperm and egg need the normal number of chromosomes. 2. Sperm and egg combine in to produce a zygote with the normal number of chromosomes.

3. Sperm and egg are sex cells called .

4. Sperm and egg are cells because the number of chromosomes has been reduced by half.

5. The process of produces the gametes - sperm and egg.

6. The process of meiosis involves cell divisions and produces daughter cells.

7. Meiosis allows for differences in offspring as a result of sexual reproduction. This is called genetic .

8. occurs when pieces of homologous chromosomes switch places during meiosis.

9. Each gamete produced by an individual is different because homologous chromosomes line up differently each time they're produced. This is called independent .

10. After fertilization, a zygote divides by to produce a multicellular organism.