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प्रश्न
Enumerate the various changes that occur in the nucleus of the cell during prophase.
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.
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संबंधित प्रश्न
Choose the ODD one out from the following terms given and name the CATEGORY to which the others belong
Centrosome.Cell wall, Cell membrane, Large vacuoles
Match the events given in column A with the phase in mitotic cell division in column B.
| Column ‘A’ | Column ‘B’ | ||
| 1. | Chromosomes get arranged in a horizontal plane at the equator. |
a. | Anaphase |
| 2. | Daughter chromosomes move to the opposite poles of a spindle |
b. | Prophase |
| 3. | Chromosomes become visible as fine, long threads. |
c. | Telophase |
| 4. | Chromosomes lose their distinctiveness and gradually become transformed into a chromatin network. |
d. | Metaphase |
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.
Answer the following question in your own words.
What is meant by ‘chromosome’?
Choose the correct answer:
During mitosis which of the following disintegrate ___________
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:
Balbiani
Choose the correct answer:
The term 'chromosome' was coined by ___________
What are chromosomes?
Give Reasons for the following
Chromosomes are the carriers of heredity.
Explain the Term Spindle
Name the following:
Microtubules form the bipolar spindle in which stage.
Name the following:
The pattern of arrangement of genes along a chromosome.
Complete the following sentence with appropriate word:
The number of chromosomes in humans is ________.
Very Short Answer Question.
What is allosome?
The number of chromosomes found in human beings is ______.
Explain the structure of a chromosome.
The sex of the newborn child is a matter of chance and neither of the parents may be considered responsible for it. What would be the possible fusion of gametes to determine the sex of the child?
After a mitotic cell division, a human female cell will have ______.
Distinguish between the following pair:
Karyotype and Karyokinesis
