Bio 12.4 LESSON Meiosis

Match

Match the following

• chromosomes with same genes (one from each parent)

• contains both sets of chromosomes from parents

• contains a single set of chromosomes

Homologous

Diploid

Haploid

• Homologous

• Diploid

• Haploid

Match

Match the following

1. 1 Prophase

2 Metaphase

3 Anaphase

4 Telophase

• 1. 1 Prophase

• 2 Metaphase

• 3 Anaphase

• 4 Telophase

​Before meiosis begins every chromosome is copied, so the cell has four copies of each chromosome.

​resulting cells have half the normal chromosome number.

Multiple Select

Which 2 are true of Meiosis?

• cells produced by Meiosis have half of the number of chromosomes

• cells produced by Meiosis have double of the number of chromosomes

• before Meiosis begins, cells have four copies of each chromosome

• before Meiosis begins, cells have two copies of each chromosome

​As the homologous chromosomes form tetrads, they undergo a process called crossing-over. First, the chromatids of the homologous chromosomes cross over one another. Then, the crossed sections of the chromatids—which contain alleles—are exchanged.

Drag and Drop

Crossing-over is the ​

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of sections between ​

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chromosomes.

Drag these tiles and drop them in the correct blank above

homologous

exchange

deletion

different

Multiple Choice

What lines up during Metaphase I

• homologous chromosomes

• heterozygous alleles

• homozygous alleles

• heterologous chromosomes

Multiple Choice

What gets pulled to each side of the cell during Anaphase I?

• whole chromosomes

  (made of sister chromatids)

• half of a chromosome

  (one chromatid)

• homologous chromosomes

• sister nuclei

Multiple Choice

What reforms during Telophase I?

• two new nuclei

• two new chromosomes

• two complete cells

• four new chromosomes

​Unlike the first division, neither cell goes through a round of chromosome replication before entering meiosis II.

Multiple Choice

Before the second stage of Meiosis, chromosomes are replicated again.

• True

• False

​During metaphase of meiosis II chromosomes line up in the center of each cell. And as the cell enters anaphase, the paired chromatids separate.

Multiple Choice

What happens during Metaphase II and Anaphase II?

• Chromosomes line up in the middle.

  Chromatids are pulled apart.

• Chromatids line up in the middle.

  Chromosomes are pulled apart.

Drag and Drop

The end product of meiosis is ​

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daughter cells that have ​

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the normal chromosome number.

Drag these tiles and drop them in the correct blank above

four

half

two

double

Reorder

Reorder the following events in Meiosis

Start >>> Finish

• Chromosomes are replicated during INTERPHASE

• Homologous chromosomes separate during MEIOSIS I

• Two diploid cells are produced (with replicated chromosomes)

• Chromatids are separated during MEIOSIS II

• Four haploid cells are produced

1

2

3

4

5

• 1
• 2
• 3
• 4
• 5

Drag and Drop

Alleles of different genes tend to be ​

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together when those genes are located ​

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.

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inherited

on the same chromosome

on different chromosomes

bonded

​The frequency of crossing-over between genes is used to determine their distances from each other on a chromosome.
A diagram like this one called a gene map can be created with this information. It shows the location of a variety of genes on chromosome 2 of the fruit fly.

Multiple Choice

How are scientists able to make a gene map with locations of genes on a chromosome?

• high powered microscopes locate the genes

• by studying the frequency of crossing-over events

• we don't have this technology - it's fiction

• using a Punnett square to study the probabilities of offspring inheriting a gene