Investigation 4.1: Meiosis

Which important events take place during prophase I? (Choose all that apply.)

- Chromatin condenses to form visible chromosomes. - The nucleus and nucleolus disintegrate. - Homologous chromosomes pair up to form tetrads.

What happens in metaphase II? (Choose all that apply.)

- Chromosomes separate from one another.

What happens during telophase II?

- Chromosomes uncoil to form chromatin. - Four haploid gametes are being formed.

Which of the following are true? (Choose all that apply.)

- Cytokinesis is the division of the cytoplasm to form two separate cells - Cytokinesis may occur at the same time as telophase I.

Which of the following are true statements? (Choose all that apply.)

- DNA replicates during interphase.

Which of the following is true of interphase? (Choose all that apply.)

- The cell does normal cell activities during interphase. - It occurs before meiosis.

Goats have 60 chromosomes in their body cells. How many chromosomes would be in their gametes (egg or sperm cells)?

30

What are the final results after telophase II and cytokinesis are finished?

4 haploid gametes

What is a haploid cell?

A cell with half the number of chromosomes

What is uncoiled, stringy DNA called?

Chromatin

A cell with two pairs of each set of chromosomes is

Diploid

Which explanation below best describes why meiosis produces haploid cells

Egg and sperm cells have to have half the number of chromosomes as in body cells so when they combine to form a zygote, the zygote is diploid and has the correct number of chromosomes

What happens during anaphase I?

Homologous chromosomes separate and move toward opposite ends of the cell.

Meiosis I and meiosis II both have the same order for their phases. Which of the following is the correct order?

Prophase, metaphase, anaphase, telophase

What happens in anaphase II?

Sister chromatids separate and move toward opposite poles.

Which of the cells below would be most likely formed by meiosis?

Sperm cells

How is prophase II different than prophase I?

Tetrads do not form in prophase II

What happens during metaphase I?

Tetrads line up down the middle of the cell.

What is one event that may happen during telophase I?

The nucleus of each cell may reappear as two independent cells are being formed.

Why do organisms do meiosis?

To make gametes (sperm or eggs).