Gen. Bio. PPTs: Meiosis

Question 1

A division of the nucleus that REDUCES chromosome number BY HALF.

Answer 1

Meiosis

Question 2

Meiosis is important in ______________.

Answer 2

sexual reproduction

Question 3

This involves combining the genetic information of one parent with that of the other parent to produce a (a)____________.

Answer 3

Meiosis
a. genetically distinct individual

Question 4

(a) Contain only one set of chromosomes (n). Formed by process of MEIOSIS
(b) Contain two sets of chromosome (2n). Undergo MITOSIS

Answer 4

a. Haploid
b. Diploid

Question 5

Haploid. [a] _______ set of chromosome (n) - gametes or [b] _________, in humans: [c] _______ chromosomes.

Answer 5

a. one
b. sex cells
c. 23

Question 6

Diploid. [a] ________ sets of chromosomes (2n), in humans: [b] _____ pairs or [c] ________ total.

Answer 6

a. two
b. 23
c. 46

Question 7

Chromosome Pairing.
* Each chromosome in pair are IDENTICAL to the other (carry genes for same trait).
* Only ONE PAIR DIFFERS - sex chromosomes X or Y

Answer 7

Homologous Pair

Question 8

Homologous Pair. Pairing of homologous chromosomes forming a TETRAD.

Answer 8

Synapsis

Question 9

Homologous Pair. Chromatids of tetrad exchange parts.

Answer 9

Crossing Over

Question 10

What are the 2 main phases of Meiosis?

Answer 10

Meiosis I & Meiosis II

Question 11

What are the 5 subparts of Meiosis I?

Answer 11

Prophase I
Prometaphase
Metaphase I
Anaphase I
Telophase I & Cytokinesis I

Question 12

Meiosis I.
Chromosomes CONDENSES

Answer 12

Prophase I

Question 13

Meiosis I.
Homologous chromosomes pair with each other.

Answer 13

Prophase I

Question 14

Prophase I. Each pair contains ______ sister chromatids

Answer 14

four

Question 15

Meiosis I. Spindle fibers starting to attach to the chromosomes through its centromeres.

• The chromosome continues to condense.

Answer 15

Prometaphase

Question 16

Meiosis I. (a) _________ or homologous chromosomes move to center of cell.

• Independent assortment occurs

Answer 16

Metaphase I
a. Tetrads

Question 17

Meiosis I. Homologous chromosomes pulled to opposite poles.

Answer 17

Anaphase I

Question 18

Meiosis I.
* Daughter nuclei formed
* These are haploid (1n)

Answer 18

Telophase I & Cytokinesis I

Question 19

Daughter cells undergo a SECOND DIVSION; much like mitosis.
* No additional replication occurs.

Answer 19

Meiosis II

Question 20

What are the 4 subparts of Meiosis II?

Answer 20

Prophase II
Metaphase II
Anaphase II
Telophase II & Cytokinesis

Question 21

Meiosis II.
Spindle fibers form again.

Answer 21

Prophase II

Question 22

Meiosis II.
Sister chromatids move to the center.

Answer 22

Metaphase II

Question 23

Meiosis II.
Centromeres split. Sister chromatids are pulled to poles.

Answer 23

Anaphase II

Question 24

Meiosis II. Four non-identical haploid daughter cells results from one original diploid cell.

Answer 24

Telophase II & Cytokinesis

Question 25

Mitosis & Meiosis Similarities. (a) Both are forms of ____________ (b) Both involve ________ (c) Both involve disappearance of the [3] ______________________. (d) Both involves formation of ____________

Answer 25

a. nuclear division b. replication c. nucleus, nucleolus, nuclear membrane d. spindle fibers

Question 26

Mitosis & Meiosis Differences. Meiosis produces daughter cells that have _________ the number of chromosomes as the parent. Go from 2n to 1n

Answer 26

1/2

Question 26

Mitosis & Meiosis Differences. Daughter cells produced by meiosis are ____________ to one another.

Answer 26

genetically identical

Question 27

Mitosis & Meiosis Differences. In meiosis, cell division takes place (a) ___________ but (b) ___________ occurs only once.

Answer 27

a. twice b. replication

Question 28

What are the 3 causes of variation (mentioned sa ppt)?

Answer 28

Crossing Over: Prophase 1 Independent Assortment: Metaphase 1 and 2 Random Fertilization

Question 29

Differences between members of a population.

Answer 29

Variation

Question 30

Variation. Meiosis results in ______________ of chromosomes in gametes.

Answer 30

random separation

Question 31

Variation. Causes _______ populations that over time can be stronger for survival.

Answer 31

diverse

Question 32

Complete process of meiosis I and meiosis II to produce 4 spermatids.

Answer 32

Spermatocytogenesis

Question 33

Differentiation of spermatids to spermatozoa.

Answer 33

Spermiogenesis

Question 34

It is the production of female gametes (ova) within ovaries (sometimes it happens in the oviduct). Unlike in spermatogenesis, this starts during the fetal development.

Answer 34

Ooogenesis