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प्रश्न
Explain the structure of chromosomes with labelled diagram.
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उत्तर
Structure of chromosome:
- A typical chromosome consists of two chromatids joined together at the centromere also known as primary constriction.
- Primary constriction consists of a disk shape plate called the kinetochore. During cell division, spindle fibers get attached to the kinetochore.
- Apart from primary constriction, a few chromosomes possess an additional one or two constrictions called secondary constriction.
- At secondary constriction I (nucleolar organizer), nucleolus becomes organized during interphase.
- A satellite body (SAT body) is attached at secondary constriction II, in very few chromosomes.
- Each chromatid in turn contains a long, unbranched, slender, highly coiled double-stranded DNA thread, called chromonema, extending through the length of the chromatid.
- The ends of chromosomes (i.e. chromatids) are known as telomeres.
A: Parts of chromosomes
B: Showing secondary constrictions and details
Structure of Chromosome
संबंधित प्रश्न
“First meiotic division is the reduction division” what does the word ‘reduction’ refer to in this statement?
Choose the correct answer:
Chromosome is most coiled at (in mitosis) ____________
Mention the contribution of the scientist given below in the study of chromosome:
Sutton and Boveri
Synthesis phase in the cell cycle is called so for the synthesis of more of
What is the importance of meiosis?
Write the functional activity of the following structure:
Chromosome
The region of the chromosome where the spindle fibres get attached during cell division ______
The chromosomes are duplicated in ______.
The female gamete/egg cell of a human cell will have ______.
The two non-sister chromatids of a paired chromosome are attached to each other at ______ during the process of crossing over.
