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प्रश्न
Enumerate the various changes that occur in the nucleus of the cell during prophase.
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उत्तर
Changes which occur in the nucleus of the cell during mitosis:
During prophase:
- The nuclear membrane and the nucleolus disappear.
- The duplicated chromosomes begin to move towards the equator of the cell.
संबंधित प्रश्न
The term “chromosomes” literally means ______.
Mention whether the following statement is (T) Or (F). Give reason in support of your answer.
The unfertilized human egg has half the number of chromosomes of the body cells.
The component which is in the nuclei of cells and carries the hereditary characteristics is called ______.
Choose the correct answer:
In an interphase cell chromosome are as _____________
Choose the correct answer:
Chromosomes number is halved in ____________
Mention the contribution of the scientist given below in the study of chromosome:
Sutton and Boveri
Choose the correct answer:
The term 'chromosome' was coined by ___________
What are chromosomes?
(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.
Explain the Term Leptotene
Name the following:
Pairs of chromosomes, present in human egg cells.
Name the following:
The number of chromosomes present in human gametes.
Define euploidy.
Explain the structure of a chromosome.
Normally, genes occur in a pair of chromosome, but genes of X and Y chromosomes shows different gene loci indicating ______.
Differentiate between X-chromosome and Y-chromosome with reference to –
- length of non-homologous regions
- type as per the position of the centromere
Small swellings on the surface of the chromosome are called______.
The two non-sister chromatids of a paired chromosome are attached to each other at ______ during the process of crossing over.
