1. KEY CONCEPT During meiosis, diploid cells undergo two cell divisions that result in haploid cells.

2. I can compare and contrast the two rounds of division in meiosis.
I can describe how haploid cells develop into mature gametes.

3. Cells go through two rounds of division in meiosis.
Meiosis reduces chromosome number and creates genetic diversity.

4. Pairs of homologous chromosomes separate in meiosis I.
Meiosis I and meiosis II each have four phases, similar to those in mitosis.
Pairs of homologous chromosomes separate in meiosis I.
Homologous chromosomes are similar but not identical.
Sister chromatids divide in meiosis II.
Sister chromatids are copies of the same chromosome.
homologous chromosomes
sister
chromatids
sister
chromatids

5. Meiosis I occurs after DNA has been replicated.
Meiosis I divides homologous chromosomes in four phases.

6. Meiosis II divides sister chromatids in four phases.
DNA is not replicated between meiosis I and meiosis II.

7. Meiosis differs from mitosis in significant ways.
Meiosis has two cell divisions while mitosis has one.
In mitosis, homologous chromosomes never pair up.
Meiosis results in haploid cells; mitosis results in diploid cells.

8. Haploid cells develop into mature gametes.
Gametogenesis is the production of gametes.
Gametogenesis differs between females and males.
Sperm become streamlined and motile.
Sperm primarily contribute DNA to an embryo.
Eggs contribute DNA, cytoplasm, and organelles to an embryo.
During meiosis, the egg gets most of the contents; the other cells form polar bodies.

9. Which of the following statements is true of homologous chromosomes?
a. They are exact copies.
b. They contain the same genes.
c. They divide during meiosis II.
d. They connect to each other.

10. Which phrase best describes meiosis I?
a. duplication of paired chromosomes
b. fusion of sister chromatids
c. division of homologous chromosomes
d. creation of two diploid cells

11. What happens to sister chromatids in meiosis II?
a. They duplicate.
b. They are divided.
c. They remain together.
d. They do not take part.

12. Gametogenesis is the term for
a. the production of gametes.
b. the fertilization of eggs.
c. the development of polar bodies.
d. the movement of sperm.

13. What does an egg contribute to the embryo that a sperm does not contribute? a. polar bodies b. organelles c. DNA d. germ cells