Meiosis

Question 1

Is a type of cell division in sex cells/germ cells (gametes)

Occurs only in germ cells in gonads
• testes Jovaries

Occurs in flowers
•ovary and anther

Answer 1

Meiosis

Question 2

One copy of each chromosome

Answer 2

Haploid

Question 3

Two copies of each chromosome

Answer 3

Diploid

Question 4

Pair of chromosomes similar in shape, size, and types of genes.

One comes from the mother and the other from the father.

Answer 4

Homologous chromosomes

Question 5

A special type of cell division where one cell can produce four genetically different cells with half the number of chromosomes. Meiosis is how gametes are made.

Answer 5

Meiosis

Question 6

Meiosis (Reduction division)

Answer 6

Meiosis 1/Meiosis 2

Prophase 1/Prophase 2
Metaphase 1/ Metaphase 2
Anaphase 1/ Anaphase 2
Telophase 1/ Telophase 2

Question 7

The longest phase.

This phase can be divided into 5 stages
a) Leptotene
b) Zygotene
c) Pachytene
d) Diplotene
e) Diakinesis

Answer 7

Prophase 1

Question 8

Prophase begins Chromosomes start to condense

Answer 8

Leptotene

Question 9

Synapsis begins Synaptonemal complex forms

Answer 9

Zygotene

Question 10

Crossing over DNA exchanged by non-sister chromatids

Answer 10

Pachytene

Question 11

Synapsis ends. Chiasma visible within bivalent

Answer 11

Diplotene

Question 12

Prophase ends Nuclear membrane disintegrates

Answer 12

Diakinesis

Question 13

may occur between non-sister chromatids at the chiasmata.

segments of non- sister chromatids break and reattach to the other chromatid

Answer 13

Crossing over

Question 14

are the sites of crossing over

Answer 14

Chiasmata (chiasma)

Question 15

The pairs of chromosomes line up on the equator

Answer 15

Metaphase 1

Question 16

movement of chromosomes to both poles of a meiotic cell via spindle fibres This mechanism separates homologous chromosomes into two separate groups.

Answer 16

Anaphase 1

Question 17

Nuclear membranes form.

The cell separates into 2 cells.

Answer 17

Telophase 1 and cytokinesis

Question 18

Now the cells are haploid

The chromosomes do not decondense at the end of meiosis 1

Answer 18

Prophase 2

Question 19

the chromosomes align along the equatorial plate in both cells

Answer 19

Metaphase 2

Question 20

the chromosomes separate at the centromeres

The spindle fibers pull the separated chromosomes toward each pole of the

Answer 20

Anaphase 2

Question 21

the chromosomes are enclosed in nuclear membranes

Answer 21

Telophase 2

Question 22

Four haploid daughter cells and nucleolus reappears

Answer 22

Cytokinesis 2 in meiosis

Question 23

there are four haploid daughter cells that go on to develop into either sperm or egg cells.

Answer 23

Meiosis

Question 24

In males, meiosis results in 4 sperm cells

In females, meiosis results in 1 egg cell and three polar bodies, which are not used in reproduction

Answer 24

Gametes formation

Question 25

Begins with diploid cell • Only produces gametes: genetically different haploid cells • Has two cell division stages: meiosis 1 and meiosis 11 Meiosis produces two haploid cells each containing one chromosome from the homologous pairs Meiosis Ilseparates sister chromatids to produce four haploid gametes

Answer 25

Meiosis

Question 26

pairing of homologous chromosomes

Answer 26

Synapsis

Question 27

4 sister chromatids of paired homologous chromosomes

Answer 27

Tetrad

Question 28

results when control of the cell cycle is lost, and cells divide uncontrollably it is a result of unchecked cell division caused by a breakdown of mechanisms that regulate the cell cycle

Answer 28

Cancer

Question 29

is the development of cancer.

Answer 29

Carcinogenesis

Question 30

tumor cells grow only locally and cannot spread by invasion or metastasis

Answer 30

Benign (not cancer)

Question 31

cells invade neighboring tissues, enter blood vessels. and metastasize to different sites

Answer 31

Malignant(cancer)