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प्रश्न
Why gametes have a haploid number of chromosomes?
उत्तर
The gametes are produced as a result of meiosis hence they have haploid number of chromosomes.
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संबंधित प्रश्न
Chromosomes get aligned at the centre of the cell during:
A. Metaphase
B. Anaphase
C. Prophase
D. Telophase
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 |
Fill in the blank
The _______ (s) are surrounded by radiating rays called aster
Chromosomes are mainly made up of ______.
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 _____________
Choose the correct answer:
The term 'chromosome' was coined by ___________
The number of chromosomes in a certain type of cell division is halved. This kind of cell division occurs in ______.
Draw a duplicate chromosome and label its part.
Explain the Term Spindle
Name the following:
Pairs of chromosomes, present in human egg cells.
Complete the following sentence with appropriate word:
The number of chromosomes in humans is ________.
The loss of one or more chromosomes in ploidy is called ______.
The thin thread-like structures found in the nucleus of each cell are called ______.
Match the following.
| 1. Autosomes | - | Trisomy 21 |
| 2. Diploid condition | - | 9 : 3 : 3 : 1 |
| 3. Allosome | - | 22 pair of chromosome |
| 4. Down’s syndrome | - | 2n |
| 5. Dihybrid ratio | - | 23rd pair of chromosome |
Identify the TRUE statements with respect to aneuploidy.
- When the chromosome number is not the exact multiple of the haploid set, it is described as aneuploidy.
- Aneuploidy is only addition of one or more chromosome(s) to the total number of chromosomes in a cell.
- Aneuploidy is further classified as hypoploidy and hyperploidy.
Which of the following is TRUE with respect to the genes which inherit together during crossing over?
After a mitotic cell division, a human female cell will have ______.
