Cell Cycle and Cell Division Test

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Cell Cycle and Cell Division Test - 23

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Weekly Quiz Competition

Question 1
1 / -0

Fill in the blanks.
The exchange of chromosome segments between maternal and paternal chromatids during meiosis I is called _______.

A
Linkage

B
Diakinesis

C
Crossing over

D
Dominant
Solution
The exchange of chromosome segments between maternal and paternal chromatid is done during the pachytene stage of prophase 1. This process is called crossing over.
The crossing over takes place between homologous chromosomes.
So, the correct answer is (C).
Question 2
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............. is present between meiosis I and meiosis II.

A
Interphse

B
Prophase II

C
Interkinesis

D
Telophase II

Solution

Meiosis comprises of two division, meiosis I and meiosis II. The meiosis I occur in following stages prophase I, metaphase I, anaphase I and telophase I.
The meiosis II occurs in following stages prophase II, metaphase II, anaphase II and telophase II.
Interkinesis or interphase II is a period of rest that cells of some species enter during meiosis, between meiosis I and meiosis II. No DNA replication occurs during Interkinesis. DNA replication occurs during the Interphase I stage of meiosis.
So, the correct answer is option C.
Question 3
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Meiosis is also called as haplosis as

A
Meiosis occurs in haploid cell

B
Meiosis nullify the effect of fertilization

C
Meiosis reduce the number of chromosome to half

D
None of the above

Solution

The meiosis occurs in two stages meiosis I and meiosis II. Meiosis I is characterized by the pairing of homologous chromosomes, crossing over and separation of homologous chromosomes, so that each daughter cell produced after meiosis I have one half the chromosome number as compared to the parent cell.
So, the correct answer is option C.
Question 4
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Cells that can divide by meiosis is

A
Sporocyte

B
Meiocytes

C
Primary spermatocyte and primary oocytes

D
All of the above

Solution

In plants, sporocytes are the cells which divide by meiosis to produce spores. The spores are haploid bodies produced after meiosis in spore mother cells or sporocytes. In animals, the cells meiocytes are the cells which undergo meiosis. The spermatocytes undergo meiosis to produce sperms while oocytes are the cells which undergo meiosis to produce egg cells.
So, the correct answer is option D.
Question 5
1 / -0

Which among the following is the correct order of phases in prophase I?

A
Leptotene, diakinesis, pachytene, diplotene, zyotene

B
Leptotene, zygotene, pachytene, diplotene, diakinesis

C
Diakinesis, diplotene, pachytene, zygotene, leptotene

D
Leptotene, pachytene, zygotene, diplotene, diakinesis

Solution

Meiosis occurs in two phases meiosis I and meiosis II. The meiosis I comprises of prophase I, metaphase I, anaphase I, telophase I. The prophase I comprises of leptotene, zygotene, pachytene, diplotene and diakinesis.
So, the correct answer is option B
Question 6
1 / -0

Crossing over of chromosomes during meiosis leads to

A
Mutation

B
Sex determination

C
New gene combination

D
Loss of chromosomes

Solution

The meiosis occurs in two stages, meiosis I and meiosis II. Meiosis I is characterised by pairing of homologous chromosomes, crossing over between homologous chromosomes and separation of homologous chromosomes, so that each daughter cell produced after meiosis I has one half the chromosome number as compared to the parent cell. The crossing over leads to new gene combination. The new gene combinations are the primary factor responsible for evolution of organisms.
So, the correct answer is option C.
Question 7
1 / -0

Which among the following are cytogenetic events which occur during prophase I?

A
Synapsis

B
Crossing over

C
Chiasma formation

D
All of the above

Solution

Meiosis comprises of two divisions meiosis I and meiosis II. The meiosis I occur in following stages prophase I, metaphase I, anaphase I and telophase I. Crossing over occurs during meiosis I. Homologous chromosomes pair during meiosis I, this is called as synapsis. The synapsis occurs between homologous chromosomes and facilitates crossing over. The exact point of crossing over is revealed by the formation of cross-shaped structures or chiasma formation during prophase I.
So, the correct answer is option D.
Question 8
1 / -0

A drug called colchicine interferes in mitosis during the spindle microtubule formation; it does so by

A
Arresting chromosome movement

B
Breaking microtubules

C
Thickening microtubles

D
Arresting centriole movement

Solution

Colchicine is an anticancerous drug obtained from Liliaceae plant Colchicum autumnale. This drug interferes with spindle formation and breaks microtubule thus preventing cellular division. It is also known as a mitotic poison.
So, the correct answer is option B.
Question 9
1 / -0

How many cells and meiosis are required to produce 200 cells?

A
25, 25

B
50, 25

C
50, 50

D
50, 125

Solution

In meiosis, each mother cell divides to produce 4 daughter cells with half the chromosome number as compared to the mother cell. Assuming that all four cells survive and mature. A total of fifty cells will need to undergo fifty meiotic divisions to produce two hundred haploid cells.
So, the correct answer is option C.
Question 10
1 / -0

If root cell has 42 chromosomes then the number of chromosome in egg is

A
42

B
21

C
7

D
63
Solution
- The egg in angiosperms is produced after meiotic cell division in the megaspore mother cell.
- The megaspore mother cell is diploid and the egg cell is haploid. If the root cell is having 42 chromosomes, the number of chromosomes present in the egg will be half, i.e., 21.
  Hence, option B is correct.

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Cell Cycle and Cell Division Test - 23

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Cell Cycle and Cell Division Test - 23

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Question 1

Linkage

Diakinesis

Crossing over

Dominant

Solution

Question 2

Interphse

Prophase II

Interkinesis

Telophase II

Solution

Question 3

Meiosis occurs in haploid cell

Meiosis nullify the effect of fertilization

Meiosis reduce the number of chromosome to half

None of the above

Solution

Question 4

Sporocyte

Meiocytes

Primary spermatocyte and primary oocytes

All of the above

Solution

Question 5

Leptotene, diakinesis, pachytene, diplotene, zyotene

Leptotene, zygotene, pachytene, diplotene, diakinesis

Diakinesis, diplotene, pachytene, zygotene, leptotene

Leptotene, pachytene, zygotene, diplotene, diakinesis

Solution

Question 6

Mutation

Sex determination

New gene combination

Loss of chromosomes

Solution

Question 7

Synapsis

Crossing over

Chiasma formation

All of the above

Solution

Question 8

Arresting chromosome movement

Breaking microtubules

Thickening microtubles

Arresting centriole movement

Solution

Question 9

25, 25

50, 25

50, 50

50, 125

Solution

Question 10

42

21

7

63

Solution

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