Meiosis

Question 1

Prophase I

Answer 1

The chromosomes condense and the nuclear envelope breaks down. Crossing over occurs

Question 2

Meiosis I

Metaphase I

Answer 2

Pairs of homologous chromosomes move to the equator of the cell

Question 3

Meiosis I

Anaphase I

Answer 3

Homologous chromosomes move to the opposite poles of the cell

Question 4

Meiosis I

Telophase and Cytokinesis

Answer 4

Chromosomes gather at the poles of the cells. The cytoplasm divides

Question 5

Meiosis II

Prophase II

Answer 5

A new spindle forms around the chromosomes

Question 6

Meiosis

Metaphase II

Answer 6

Chromosomes line up at the equator

Question 7

Meiosis

Anaphase II

Answer 7

Centromeres divide, chromatids move to opposite poles of the cells

Question 8

Telophase II and cytokinesis

Answer 8

A nuclear envelope forms around each set of chromosomes. The cytoplasm divides

Question 9

Importance of Meiosis?

Answer 9

-Cells reduce ploidy and increase genetic variation in preparation for sexual reproduction

Question 10

How does Meiosis increase genetic variation?

Answer 10

Independent assortment and Crossing over

Question 11

Define Ploidy

Answer 11

The number of sets of chromosomes (homologous) in a cell

Question 12

Does Meiosis increase or reduce ploidy? Explain

Answer 12

Meiosis reduces ploidy to prepare for sexual reproduction

ex. Adult cell starts at 2n (haploid) goes through meiosis to become just one n (one chromosome) ie gametes (egg and sperm) , then the gamete is fertilized to form a zygote (2n), the zygote goes through mitosis