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