Anaphase I

Q.

Question 2

At which stage of meiosis does the genetic constitution of gametes is finally decided
(a) Metaphase-I
(b) Anaphase-II
(c) Metaphase-II
(d) Anaphase-I

Q.

What will be the DNA content at the end of the S-phase of the cell, if its meiotic products have 8 pg of DNA in each cell?

1. 16

2. 32

3. 64

4. 8

Q.

If a diploid cell has 18 chromosomes, how many chromatids will it have at the bivalent stage?

1. 9

2. 36

3. 54

4. 18

Q.

What is the point at which two chromatids of a chromosome held together called?

Q.

Number of meiotic and mitotic divisions to form 7 celled 8 nucleated female gametophyte

Q.

Question 4
During Anaphase - I of meiosis
(a) homologous chromosomes separate
(b) non-homologous autosomes separate
(c) sister chromatids separate
(d) non-sister chromatids separate

Q. Replication of centriole occurs during

1. Early anaphase
2. Mid metaphase
3. Late metaphase
4. Interphase

Q. Assertion : Endosperm is a nutritive tissue and it is triploid.

Reason: Endosperm is formed by fusion of secondary nucleus to second male gamete. It is used by developing embryo.

1. If both assertion and reason are true but reason is not the correct explanation of assertion
2. If both assertion and reason are true and reason is the correct explanation of assertion
3. If assertion is true but reason is false
4. If both assertion and reason are false

Q.

The movement of chromosomes towards opposite poles during Anaphase – I of meiosis is called:

1. Non – disjunction

2. Disjunction

3. Cytokinesis
4. Diakinesis

Q.

How many Spindle fibres are formed in a Meiosis?

Q.

In meiosis, chromosome duplication is followed by ______________.

Q. Which of the following is the shortest of all stages in mitosis?
(a) prophase. (b) metaphase
(c) anaphase. (d) interphase

Q. Microtubules from opposite poles of spindle get attached to kinetochores of sister chromatids during

1. anaphase II
2. prophase II
3. metaphase II
4. metaphase I

Q.

List the main differences between mitosis and meiosis.

Q. What would be the DNA content in a diploid cell at anaphase-I if its egg cell has $10$ pg DNA?

1. $10$ pg
2. $20$ pg
3. $30$ pg
4. $40$ pg

Q.

In which stage does the crossing over occur ?

Q. Assertion :Metaphase II begins with splitting of centromere of each chromosomes into two. Reason: In Anaphase II chromosomes align at the equator.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. In a diploid cell after S-phase quantity of DNA is $80$ Pg(picogram) after anaphase-II situation will be in each daughter nucleus.

1. Diploid $40$, Pg DNA
2. Diploid $20$, Pg DNA
3. Haploid $20$, Pg DNA
4. Haploid $40$, Pg DNA

Q. Segregation or Mendelian factors (no linkage, no crossing over) occurs during

1. Anaphase II
2. Anaphase I
3. Diplotene
4. Metaphase I

Q. If the egg of an organism has $40$ pg of DNA in its nucleus, how much DNA would a diploid cell of same organism have in pachytene(X), diakinesis(Y) and anaphase-I(Z)?

1. X$=80$ pg, Y$=80$ pg, Z$=160$pg
2. X$=160$pg, Y$=80$ pg, Z$=160$pg
3. X$=80$pg, Y$=160$pg, Z$=80$ pg
4. X$=160$ pg, Y$=160$ pg, Z$=160$pg

Q.

Define centromere.

Q. When a cell divides by meiosis, reduction in the number of chromosomes occurs during which of the following stages?

1. Anaphase I
2. Anaphase II
3. Prophase I
4. Telophase II

Q. Disjunction is

1. Chromosome separation during mitosis
2. Chromosome separation during prophase I
3. Chromosome separation in anaphase I
4. Chromosome separation during metaphase I

Q. Assume the cell has a diploid number of $4$. If the above chromosomes are in the tetrad or bivalent stage of meiosis, which statement below is correct about the events of anaphase I?

1. Two of the tetrads will go to one cell, and two will go to the other.
2. Sister chromatids will break apart and each will go in one of four cells.
3. One member of each homologous pair will go into each of the two cells.
4. The tetrads will separate but each new cell will still be diploid since each chromosome has two chromatids.

Q. Give the name of the phases of meiosis, in which
I. the chromosome number is reduced to haploid state.
II. the amount of DNA is reduced to haploid state.

1. Anaphase-I, Metaphase-II
2. Anaphase-II, Metaphase-I
3. Anaphase-I, Anaphase-II
4. Anaphase-II, Anaphase-I

Q. During meiosis-I, homologous chromosomes of one pair switch their position without affecting the position of another pair. This is known as?

1. Segregation
2. Separation
3. Co-dominance
4. Independent assortment

Q. Disjunction is

1. Chromosome separition during interphase
2. Chromosome separation during prophas I
3. Chromosome separation in anaphase I
4. Chromosome separation duri metaphase I

Q. During ___ , homologous chromosomes separate and dyads move to opposite poles of the spindle.

1. Prophase I
2. Anaphase II
3. Metaphase I
4. Anaphase I

Q. The separation of homologous chromosomes during anaphase I is called as

1. Synapsis
2. Disjunction
3. Crossing over
4. Non-disjunction

Q. In which phase of meiosis-I the two chromosome can align at the metaphase plate independently of each other

1. Metaphase-II
2. Metaphase-I
3. Anaphase-I
4. Telophase-I