QUIZ 4.2

Question 1

Sex cells or gametes are produced from ____ division.

Answer 1

meiotic

Question 2

Meiotic Division and its functions

Answer 2

● production of functional sex cells or gametes
● two rounds: meiosis I and meiosis II
● reduction in the chromosome number
● allows restoration of original chromosome number during fertilization

Question 3

_____ involves two rounds of cytokinesis which will ultimately produce four daughter cells with a reduced chromosome number.

Answer 3

Meiosis

Question 4

comes after the G2 phase of the cell cycle.

Answer 4

Meiosis I

Question 5

● Condensation
● Synapsis
● Crossing over

Answer 5

Prophase 1

Question 6

site of crossing over between homologous pairs we have the

Answer 6

Chiasma

Question 7

Pairs of chromosome are called _____

Answer 7

homologous chromosomes

Question 8

● meiotic spindle formation
● further chromosomal condensation
● further disintegration of nuclear envelope

Answer 8

Prometaphase 1

Question 9

● alignment of the homologous chromosomes at metaphase plate
● Maternal and paternal chromosomes are randomly arranged
● facilitates reduction in chromosome number

Answer 9

Metaphase 1

Question 10

● separation of the homologous pairs (sister cromatids)
● Maternal and paternal members move to either pole

Answer 10

Anaphase 1

Question 11

● the cytoplasm divides
● Chromosomes reach opposite poles.

Answer 11

Telophase I and Cytokinesis

Question 12

is a REDUCTIONAL division.

Answer 12

Meiosis I

Question 13

Is an EQUATIONAL division

Answer 13

Meiosis II

Question 14

● Preceded by an interkinesis, chromosomes recondense
● new spindle forms around the chromosomes

Answer 14

Prophase II

Question 15

● Disintegration of the nuclear envelope

Answer 15

Prometaphase II

Question 16

● alignment of the duplicated chromosomes

Answer 16

Metaphase II

Question 17

● seperation of sister chromatids

Answer 17

Anaphase II

Question 18

nuclear envelope forms around each set of chromosomes

Answer 18

Telophase II and Cytokinesis

Question 19

___ Formed by synapsis of homologous chromosomes

Answer 19

tetrad

Question 20

maintains an identical set of genetic material in the daughter cells

Answer 20

Mitosis

Question 21

___ reduces this amount and introduces new combinations.

Answer 21

meiosis

Question 22

Synapsis occurs only in meiosis ___.

Answer 22

I

Question 23

Tetrads line up and separate into individual homologous chromosomes in meiosis ___

Answer 23

I

Question 24

Sister chromatids line up and separate into individual chromosomes in meiosis ___.

Answer 24

II

Question 25

Crossing over occurs only in meiosis ___

Answer 25

I

Question 26

Importance of crossing over (FIE)

Answer 26

● facilitates genetic **recombination** ● increases chances of survival ● enhances **genetic variation**

Question 27

This event refers to the **exchange of segments** of the homologous chromosomes during meiosis I.

Answer 27

Crossing over

Question 28

involves the **pairing** of the members of homologous chromosomes so as to allow them to undergo crossing over and to segregate them.

Answer 28

Synapsis

Question 29

is considered the **reductional division** in meiosis because it reduces the number of sets of chromosomes from two to one

Answer 29

Meiosis I

Question 30

by contrast, is considered the **equational division** in meiosis because there is no further reduction of the chromosome number in daughter cells.

Answer 30

Meiosis II