Cell Cycle and Cell Division Test

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Cell Cycle and Cell Division Test - 18

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Question 1
1 / -0

In meiosis, the daughter cells are not similar to that of parent because of

A
Crossing over

B
Synapsis

C
Both A and B

D
None of the above

Solution

In meiosis, daughter cells are different from parent cell due to the process of crossing over. Crossing over occurs between homologous chromosomes and chromosomal segments are exchanged between homologous chromosomes during crossing over which is the main cause of variation.
So, the correct answer is option A.
Question 2
1 / -0

The number of chromosome groups at the equatorial plate in metaphase I of meiosis, in a plant with diploid (2n) chromosome number equal to 50 shall be

A
50

B
25

C
30

D
100

Solution

The first division of meiosis is characterized by pairing between homologous chromosomes and exchange of segments between them, so that if the normal diploid number is 50, 25 chromosome groups or 25 pairs are expected to be seen in metaphase I.
So, the correct answer is option B.
Question 3
1 / -0

Bivalents in meiosis are

A
Tetrad

B
Pairs of non-homologous chromosomes

C
Pairs of several chromatids

D
Pairs of homozygous chromosomes

Solution

Meiosis is characterized by the pairing of homologous chromosomes. Each such pair of the homologous chromosome is actually made up of two sister chromatids. Thus, each pair is actually a tetrad of chromatids. Two of these chromatids which are joined together at centromere are called as sister chromatids. Each pair of sister chromatid is non-sister chromatid for the other pair of sister chromatids.
So, the correct answer is option A.
Question 4
1 / -0

In which phase of mitosis, the chromosomes are arranged around the equator of the spindle?

A
Prophase

B
Metaphase

C
Anaphase

D
Telophase

Solution

Chromosomes are the shortest and thickest during metaphase. It is the stage in which nuclear envelope disappears completely so that nucleoplasm comes in contact with cytoplasm. Chromosomes are arranged at the equator and form a sort of metaphasic plate.
So, the correct answer is option B.
Question 5
1 / -0

The significance of meiosis lies in

A
Reduction of the diploid number of chromosomes to haploid

B
Maintaining constancy in the number of diploid chromosomes during sexual reproduction

C
Production of genetic variability in the population of a species

D
All of the above

Solution

Meiosis is also known as reductional division. It mainly takes place in reproductive cells. It produces genetic variability during the recombination process of the meiosis. It maintains the constancy in the number of diploid chromosomes during sexual reproduction by meiosis II which is an equational division.
So, the correct answer is option D.
Question 6
1 / -0

Recombination of genes occur at

A
Prophase in mitosis

B
Prophase I in meiosis

C
Prophase II in meiosis

D
Metaphase II in meiosis

Solution

Recombination of genes occur at prophase I in meiosis I. During pachytene stage, there is formation of recombination nodules which are the sites of crossing over.
So, the correct answer is 'Prophase I in meiosis'
Question 7
1 / -0

Which cell division is found during cleavage?

A
Amitosis

B
Mitosis

C
Closed mitosis

D
Meiosis

Solution

Closed mitosis also occurs during cleavage or embryogeny. In a closed mitosis, the chromosomes divide inside an intact cell nucleus. During cleavage, the nuclear membrane persists so the mitosis takes place inside the cell itself.
So, the correct answer is option C.
Question 8
1 / -0

The major event that occurs during the anaphase of mitosis, which brings about the equal distribution of chromosomes, is

A
Replication of the genetic material

B
Splitting of the chromatids

C
Splitting of the centromeres

D
Condensation of the chromatin

Solution

Anaphase of mitosis is characterized by splitting of centromere and separation of sister chromatids, this converts the two chromatids into daughter chromosomes.
So, the correct answer is option C.
Question 9
1 / -0

How many number of mitotic divisions required for the formation of 128 cells?

A
127

B
32

C
7

D
64

Solution

Each mother cell produces two daughter cells after a mitotic division. By using, 2$$^n $$ we can find out the number of mitotic divisions.
2$$^n $$ = 128
$$n$$ = 7
So, the correct answer is option C.
Question 10
1 / -0

In which stage of cell division chromosomes are most condensed?

A
Prophase

B
Metaphase

C
Anaphase

D
Telophase

Solution

Strasburger in 1884 defined a stage in the nuclear division as metaphase after the time when he mistakenly thought chromosomes had just divided into chromatids. It was later realized that chromosomes are already doubled before the nuclear division begins. However, the term "metaphase" has stuck.
Metaphase chromosomes are often chosen for karyotyping and for chromosome analysis because they are arranged at equatorial plane and readily visible and are most condensed.
So, the correct answer is 'Metaphase'

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Cell Cycle and Cell Division Test - 18

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Cell Cycle and Cell Division Test - 18

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Question 1

Crossing over

Synapsis

Both A and B

None of the above

Solution

Question 2

50

25

30

100

Solution

Question 3

Tetrad

Pairs of non-homologous chromosomes

Pairs of several chromatids

Pairs of homozygous chromosomes

Solution

Question 4

Prophase

Metaphase

Anaphase

Telophase

Solution

Question 5

Reduction of the diploid number of chromosomes to haploid

Maintaining constancy in the number of diploid chromosomes during sexual reproduction

Production of genetic variability in the population of a species

All of the above

Solution

Question 6

Prophase in mitosis

Prophase I in meiosis

Prophase II in meiosis

Metaphase II in meiosis

Solution

Question 7

Amitosis

Mitosis

Closed mitosis

Meiosis

Solution

Question 8

Replication of the genetic material

Splitting of the chromatids

Splitting of the centromeres

Condensation of the chromatin

Solution

Question 9

127

32

7

64

Solution

Question 10

Prophase

Metaphase

Anaphase

Telophase

Solution

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