Meiosis

Question 1

Which type of cell is Zygote?

Answer 1

Totipotent

Question 2

Define Gametogenesis

Answer 2

Formation and development of gametes from bipotential precursor cells

Question 3

Gametogenesis in men

Answer 3

Spermatogenesis

Question 4

Gametogenesis in female

Answer 4

Oogenet

Question 5

Site of Gametogenesis

Answer 5

Meiocytes in gonads

Question 6

First meiotic division

Answer 6

Reduction division

Question 7

Second meiotic division

Answer 7

Mitosis

Question 8

Result of Gametogenesis

Answer 8

1. Haploid chromosomes

2. Alteration in shape of cells

Question 9

Why is Meiosis II exceptional?

Answer 9

Abnormal interphase, no replication

Question 10

One replication

Answer 10

Two nuclear division

Question 11

X and Y homologous?

Answer 11

Homologous segments on tips of short arm

Question 12

Static Population

Answer 12

Incapable of division

Question 13

Stable population

Answer 13

Potential to divide

Question 14

Renewing population

Answer 14

Continuously divide

Question 15

Two phases of Cell Cycle

Answer 15

Interphase and Mitotic phase

Question 16

Subdivision of Mitotic phase

Answer 16

Karyokinesis

Cytokinesis

Question 17

Karyokinesis

Answer 17

Prophase
Metaphase
Anaphase
Telophase

Question 18

Prophase events

Answer 18

Condensation of chromosomes
Nucleolus disappear
Nuclear envelope start disintegrating
Centrioles migrate
Mitotic spindle starts forming

Question 19

Metaphase

Answer 19

Envelope disappear
Interpolar and kinetochore microtubules
Complete condensation of chromosomes
Equatorial plate

Question 20

Anaphase

Answer 20

Sister chromatid separate at centromere
Depolymerization of kinetochore
Elongation of interpolar microtubules

Question 21

Telophase

Answer 21

Cytokinesis start
Envelope reappear
Nucleolus reappear
Daughter nuclei connected via midbody

Question 22

Cytokinesis

Answer 22

Contractile ring
Cleavage furrow
Two daughter cells

Question 23

Components of contractile ring

Answer 23

Actin

Myosin II

Question 24

proteins in the centromere

Answer 24

kinetochore (laterally)

cohesin (center)

Question 25

centrosome is

Answer 25

MTOC - microtubule organizing centre

Question 26

types of spindles in mitotic apparatus

Answer 26

astral
interpolar
kinetochore

Question 27

which protein is responsible for pulling of chromosomes during Anaphase?

Answer 27

dyenin-motor protein

Question 28

interphase of cell cycle

Answer 28

G1
S
G2

Question 29

G1 duration

Answer 29

10 hrs

Question 30

G1 events

Answer 30

protein synthesis
cell enlarges
organelles increase in size and number
increase in ATP

Question 31

S duration

Answer 31

9 hrs

Question 32

S events

Answer 32

replication of DNA and centrioles

Question 33

G2 duration

Answer 33

4 hrs

Question 34

G2 events

Answer 34

ATP synthesis

tubulin protein for mitotic apparatus

Question 35

Meiosis I (Prophase)

Answer 35

general events are similar but longer

certain subdivisions

Question 36

leptotene

Answer 36

chromosome condensation starts

Question 37

zygotene

Answer 37

synapsis-synaptonemal complex

Question 38

the paired chromosomes are then called

Answer 38

bivalent/tetrad

Question 39

pachytene

Answer 39

chiasmata formation, crossing over occurs

Question 40

diplotene

Answer 40

separation of chromosome starts

Question 41

diakinesis

Answer 41

chiasmata terminalize

max condensation of chromosome

Question 42

amount of DNA

Answer 42

N

Question 43

amount of chromosomes

Answer 43

n

Question 44

no of chromosomes is denoted by

Answer 44

centromere no

Question 45

distinct features of meiosis

Answer 45

synapsis
crossing over
chiasmata formation

Question 46

genetic variation accounts for (3)

Answer 46

random assortment
crossing over
fertilization

Question 47

significance of meiosis

Answer 47

genetic diversity

constancy in chromosome number