Biology
The correct sequence of the following four major steps of karyokinesis during mitosis is :
(I) Chromatids convert into chromatin fibres.
(II) Chromatin fibres change to chromosomes.
(III) Chromosomes split into sister chromatids.
(IV) Chromatids move to opposite poles.
- (I), (II), (III), (IV)
- (II), (III), (IV), (I)
- (III), (II), (IV), (I)
- (IV), (I), (II), (III)
Chromosomes
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Answer
(II), (III), (IV), (I)
Reason — During prophase, chromatin fibres change to chromosomes. During metaphase, chromosomes split into sister chromatids. During anaphase, chromatids move to opposite poles. During telophase, chromatids convert into chromatin fibres.
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Related Questions
The female gamete/egg cell of a human cell will have:
- 44 + XX chromosomes
- 44 + XY chromosomes
- 22 + X chromosomes
- 22 + Y chromosomes
The figure given alongside was shown to students of class 10 in the laboratory under a compound microscope. They were told to observe the slide, identify the stage of mitotic cell division and mention the number of chromosomes which would be found in the daughter cells. Which of the following will be the correct response?
- Anaphase, 8 chromosomes
- Metaphase, 8 chromosomes
- Anaphase, 4 chromosomes
- Telophase, 4 chromosomes
Assertion (A): Both centromere and centrosome are parts of chromosome.
Reason (R): The centromere is the region where spindle fibres attach, while the centrosome helps in the formation of spindle fibres.
- Both A and R are True.
- Both A and R are False.
- A is True and R is False.
- A is False and R is True.
Assertion (A): The basic structural unit of DNA is nucleotide.
Reason (R): DNA is composed of repeating nucleosome which are made up of three components - pentose sugar, phosphate group and nitrogenous bases.
- Both A and R are True
- Both A and R are False
- A is True and R is False.
- A is False and R is True.