Cell Cycle and Cell Division Test

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Cell Cycle and Cell Division Test - 12

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Question 1
1 / -0

The number of chromosomes after phase I of meiotic division:

A
Remain unchanged

B
Become doubled

C
Become halved

D
Exhibit polyploidy
Solution
- In meiosis, I homologous chromosomes pair, exchange segments and then separate, i.e., each chromosome of a homologous pair goes to the opposite pole.
- Thus, reducing the number of chromosomes to half.
- Second division or meiosis II is normal equational division like mitosis.
So, the correct answer is 'Become halved'
Question 2
1 / -0

The complex formed by a pair of synapsed chromosomes is called as

A
Kinetochore

B
Bivalent

C
Axoneme

D
Equatorial plate

Solution

Meiosis occurs in two stages, meiosis I and meiosis II. 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. Each synapsed pair is comprised of two sister chromatids and hence is a bivalent. Each chromosome of a bivalent, in turn, is made up of two sister chromatids. Hence each pair is actually a tetrad of chromatids.
So, the correct answer is option B.
Question 3
1 / -0

A selection that acts to eliminate one extreme from an aray of phenotypes is

A
Disruptive

B
Directional

C
Stabilizing

D
Coevolution
Question 4
1 / -0

In meiosis I, a bivalent is an association of

A
Four chromatids and four centromeres.

B
Two chromatids and two centromeres.

C
Two chromatids and one centromere.

D
Two chromatids and four centromeres

E
Four chromatids and two centromeres.

Solution

Term bivalent is used to denote a pair of homologous chromosome. Each chromosome of such a pair is made up of two chromatids joined together at the centromere. Thus, each bivalent is actually made up of total four chromatids and two centromeres.
Question 5
1 / -0

Which of the following occurs only in meiosis?

A
Pairing of homologous chromosomes.

B
Separation of duplicated strand.

C
Cytokinesis.

D
Disappearance of nucleolus.

Solution

Organisms show two types of cell division- Mitosis and Meiosis. Meiosis is a specialized cell division which occurs in germ cells and produces haploid gametes. The meiosis is characterised by pairing of homologous chromosomes, exchange of segments between homologous chromosomes and reduction in chromosome number to half.
So, the correct answer is 'Pairing of homologous chromosomes.'
Question 6
1 / -0

Meiosis is also known as

A
Mitosis

B
Mulitplicational division

C
Reductional division

D
Both A and C

Solution

Meiosis is a reductional cell division which occurs mostly in reproductive cell. The daughter cell produced after meiosis has half the number of chromosomes as compared to the parent cell. It occurs in two stage they are meiosis I and meiosis II. Meiosis I is a reductional division while meiosis II is an equational division.
So, the correct answer is option C.
Question 7
1 / -0

Cure for some cancers can be achieved in the ........... phase of the cell cycle.

A
S phase

B
G$$_0$$ phase

C
G$$_1$$ phase

D
G$$_2$$ phase

Solution

The cure for some forms of cancer also lies in the G$$_1$$ phase of the cell cycle. Many cancers including breast and skin cancers have been prevented from proliferating by causing the tumor cells to enter G$$_1$$ cell cycle arrest, which prevents the cells from dividing and spreading. So, the correct answer is option C.
Question 8
1 / -0

The meiosis is involved in

A
Asexual reproduction

B
Sexual reproduction

C
Both

D
None of these

Solution

Meiosis is the process of nuclear division which takes place in reproductive cells. The daughter nuclei formed by this process contain only half the number of chromosomes present in the parent nucleus. Thus option B is the correct answer.
Question 9
1 / -0

Meiosis is not observed in

A
Angiosperm

B
Somatic cells

C
Cycas

D
Fish

Solution

Somatic cells are the normal body cell other than reproductive cells and take part in the formation of body structure and thus require mitosis cell division which increases the diploid cell numbers.
Whereas meiosis occurs in reproduction cells in which it produces the haploid cells from diploid mother cells.
Thus, the correct answer is option B.
Question 10
1 / -0

After the completion of G$$_2$$ phase, the cell enters

A
S phase

B
G$$_1$$ phase

C
G$$_0$$ phase

D
G$$_2$$ phase

E
M phase

Solution

When G$$_2$$ is completed, the cell enters a relatively brief period of nuclear and cellular division, composed of mitosis and cytokinesis, respectively. During mitosis, the genetic material is equally distributed in both the daughter cells.
So, the correct answer is option E.

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Cell Cycle and Cell Division Test - 12

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Cell Cycle and Cell Division Test - 12

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Question 1

Remain unchanged

Become doubled

Become halved

Exhibit polyploidy

Solution

Question 2

Kinetochore

Bivalent

Axoneme

Equatorial plate

Solution

Question 3

Disruptive

Directional

Stabilizing

Coevolution

Question 4

Four chromatids and four centromeres.

Two chromatids and two centromeres.

Two chromatids and one centromere.

Two chromatids and four centromeres

Four chromatids and two centromeres.

Solution

Question 5

Pairing of homologous chromosomes.

Separation of duplicated strand.

Cytokinesis.

Disappearance of nucleolus.

Solution

Question 6

Mitosis

Mulitplicational division

Reductional division

Both A and C

Solution

Question 7

S phase

G$$_0$$ phase

G$$_1$$ phase

G$$_2$$ phase

Solution

Question 8

Asexual reproduction

Sexual reproduction

Both

None of these

Solution

Question 9

Angiosperm

Somatic cells

Cycas

Fish

Solution

Question 10

S phase

G$$_1$$ phase

G$$_0$$ phase

G$$_2$$ phase

M phase

Solution

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