Intro to Meiosis

Intro to Meiosis

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Meiosis

Meiosis is the process used for making gametes -- sperm and eggs.

Gametes have 23 chromosomes; half the number of chromosomes of body cells.

Video Segments

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Multiple Choice

The process that makes body cells is

• meiosis

• mitosis

Multiple Choice

The process that produces gametes is

• meiosis

• mitosis

Multiple Choice

The number of chromosomes in a human gamete is

• 23

• 46

• 92

Multiple Choice

The process that must happen before meiosis starts is

• telophase

• metaphase

• interphase

Multiple Choice

How many chromatids does a cell have right before meiosis?

• 23

• 46

• 92

Multiple Choice

How many chromosomes does a cell have right before meiosis?

• 23

• 46

• 92

Gametes Produced

The original cell in meiosis is called a germ cell.

In sperm production, 4 sperm are produced from one germ cell.

In egg production, 1 large egg is produced from each germ cell. Three small cells are produced, but discarded.

Key vocabulary

• Spermatogenesis - the process of making sperm through meiosis

• Oogenesis - the process of making eggs through meiosis. (Pronounced o-o-genesis.)

• Ovum - egg (plural ova)

Multiple Choice

Chromosomes that have the same genes in the same location are

• analogous

• homologous

• heterozygous

Multiple Choice

In meiosis, the number of sperm produced from a germ cell is

• 1

• 2

• 3

• 4

Multiple Choice

In meiosis, the number of egg cells produced from a germ cell is

• 1

• 2

• 3

• 4

Multiple Choice

Recombinant chromosomes are produced by the process of

• interphase

• crossing over

• nondisjunction

Multiple Choice

In which phase does crossing over happen?

• interphase

• prophase

• metaphase

• anaphase

• telophase

Multiple Choice

When chromosomes fail to separate correctly during meiosis, causing a disorder, it is

• interphase

• crossing over

• random assortment

• nondisjunction

Crossing Over

The exchange of genetic material during crossing over makes the great diversity among humans and other organisms possible.

Multiple Select

Two factors that lead to great genetic diversity are

• mitosis

• independent assortment of chromosomes

• crossing over

• asexual reproduction

Multiple Choice

The benefit of crossing over during meiosis is

• elimination of unnecessary genes

• increase in genetic diversity

• increased life expectancy