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प्रश्न
Label the lettered parts of the given figure and answer the following questions:
(i) What does this diagram represent?
(ii) What is the importance of'd'?
(iii) What are the 'staining' properties of 'b' and 'c'?
(iv) Who gave the term used for this structure today?
(v) What is a?
(vi) Is 'e' present in all chromosomes?
उत्तर
(i) This diagram represents the structure of chromosome.
(ii) 'd' is centromere which gets attached to the spindle fibres.
(iii) 'b' is heterochromatin which is darkly stained region when stained with acetocarmine and 'c' is euchromatin which when stained with acetocarmine or felugen gets lightly stained.
(iv) Waldeyer
(v) Matrix
(vi) No, secondary constriction or 'e' is not present in all chromosomes.
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संबंधित प्रश्न
Answer the following question in your own words.
What is meant by ‘chromosome’?
Choose the correct answer:
In an interphase cell chromosome are as _____________
Choose the correct answer:
Centromere is related to _______________
Choose the correct answer:
If after karyokinesis, cytokinesis does not occur, then result would be _____________
Mention the contribution of the scientist given below in the study of chromosome:
Sutton and Boveri
Choose the correct answer:
Chromosomes are thin and thread like at __________
Choose the correct answer:
Sex of an individual is determined by ____________
Synthesis phase in the cell cycle is called so for the synthesis of more of
Enumerate the various changes that occur in the nucleus of the cell during anaphase of mitotic division.
(i) Draw a neat labeled diagram to show the metaphase stage of mitosis in an animal cell having ‘6’ chromosome.
(ii) How many daughter cells are formed at the end of mitosis and at the end of meiosis?
(iii) With reference to cell division explain the following terms:
(Chromatid, Centromere, Haploid).
(iv) Name the type of cell division that occurs during:
1. Growth of shoot 2. Formation of pollen grains.
3. Repair of worn out tissues.
Name the following:
Microtubules form the bipolar spindle in which stage.
Give Technical Terms
The stage when sister chromosomes separate from their paired condition.
Give Technical Terms
The phase of meiosis at which homologous chromosomes are separated.
Duplicated chromosomes are joined at a point termed ______.
Multiple Choice Question:
The period between two successive mitotic divisions is
State the Location: Polytene chromosome
In humans, the sex chromosome complement is
The two non-sister chromatids of a paired chromosome are attached to each other at ______ during the process of crossing over.
