Anaphase

Q. Attachment of spindle fibres to kinetochores of chromosomes becomes evident in:

1. Anaphase
2. Telophase
3. Prophase
4. Metaphase

Q.

Onion has 16 chromosomes in each cell. Can you tell how many chromosomes will the cell have in G1 phase, after the S phase, and after the M phase? What will be the DNA content of the cells at G1, after S, and at G2, if the content after the M phase is 2C?

Q.

Give the classification of chromosomes based on the position of the centromere.

Q.

Anaphase promoting complex (APC) is a protein degradation machinery necessary for proper mitosis of animal cells. If APC is defective in a human cell, which of the following is expected to occur?

1. Chromosomes will not condense

2. Chromosomes will be fragmented

3. Chromosomes will not segregate

4. Recombination of chromosome arms will occur

Q. Spindle fibres attach to ________ of the chromosome during ________.

1. centromere, anaphase
2. kinetochore, metaphase
3. centromere, metaphase
4. kinetochore, prophase

Q.

Define the term Chromatid.

Q.

Why is anaphase short?

Q. In which stage of mitosis, the chromosomes are dyad i.e., composed of two chromatids?

1. Prophase and metaphase
2. Anaphase and telophase
3. Prophase and telophase
4. Metaphase and anaphase

Q. During meiosis I, in which stage synapsis takes place?

1. Pachytene
2. Zygotene
3. Diplotene
4. Leptotene

Q. How many chromosomes are present in the image? How many chromatids?

1. 4 chromosomes, 4 chromatids
2. 8 chromosomes, 4 chromatids
3. 8 chromosomes 8 chromatids
4. 4 chromosomes 8 chromatids

Q.

A phase which is the reverse of prophase is

1. Metaphase

2. Interphase

3. Telophase

4. Anaphase

Q.

What happens if centriole is absent?

Q.

What happens during metaphase of mitosis?

Q. Identify the diagram and name the stage of meiosis correctly.

1. Pachytene (crossing over)
2. Zygotene
3. Leptotene
4. Diplotene

Q.

What happens during metaphase?

Q.

__________ marks the end of M.phase.

Q. Anaphase-promoting complex(APC) is a protein degradation machinery necessary for proper mitosis of animal cells. If APC is defective in a human cell, which of the following is expected to occur?

1. Chromosomes will not segregate
2. Chromosomes will be fragmented
3. Recombination of chromosome arms will occur
4. Chromosomes will not condense.

Q.

Differentiate between Anaphase I and Anaphase II

Q.

A cell at the telophase stage is observed by a student in a plant brought from a field. He tells his teacher that this cell is not like other cells at the telophase stage. There is no formation of a cell plate and the cell contains more chromosomes as compared to other dividing cells. This would result in

1. Polyteny

2. Aneuploidy

3. Polyploidy

4. Somaclonal variation

Q. The image given below is the ultrastructure of an animal cell.
What role does structure A play in mitosis?

1. It helps in DNA replication
2. It helps in cytokinesis
3. It helps to separate sister chromatids
4. It helps to dissolve nuclear envelope

Q.

What is the proper sequence in mitosis?

Q.

Draw a well-labelled diagram to show the anaphase stage of mitosis in a plant cell having four chromosomes.

Q. Splitting of centromere and hence separation of chromatids occurs during

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

Q. The segment of DNA which participates in crossing over is known is

1. Muton
2. Recon
3. Cistron
4. Replicon

Q. Which phase would have occurred before the phase shown in the image?

1. Anaphase
2. Metaphase
3. Telophase
4. Prophase

Q. The nucleolus is the site of formation of

1. spindle fibres
2. chromosomes
3. r-RNA
4. peroxisomes

Q.

Given below are sets of five terms each. Rewrite the terms in correct order In a logical sequence.

(i) Anaphase, Telophase, Prophase. Metaphase, Interphase.

(ii) Karyokinesis, S - phase, Cytokinesis, G₁ phase, G₂ phase.

(iii) Metaphase, Telophase, Prophase, Anaphase, Cytokinesis.

Q.

What are chromatids?

Q. Read the assertion and reason carefully to mark the correct option in question.

Assertion: Secondary constriction gives appearance of small fragment called the satellite.


Reason: Few chromosomes have non-staining secondary constrictions at a variable location.

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

Q. Assertion :During anaphase, centromere of each chromosome splits to the chromatids separate. Reason: During anaphase, chromatids move to opposite poles.

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