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प्रश्न
Explain the Term Leptotene
उत्तर
Leptotene: Th this step the chromosomes become visible as single threads.
APPEARS IN
संबंधित प्रश्न
State the exact location of the Centromere
Correct the following statement if there is any mistake:
If there are 46 chromosomes in a cell, there will be 23 chromatin fibres inside the nucleus during interphase.
Choose the best option out of the four alternatives a, b, c and d
Question 1:
The number of chromosomes in a certain type of cell division is halved. This kind of cell
division occurs in.
(a) Only testis
(b) Only ovary
(c) Both ovary and testis
(d) All body cells
Choose the correct answer:
Chromosomes appear at equator in ____________
Mention the contribution of the scientist given below in the study of chromosome:
Sutton and Boveri
Choose the correct answer:
Chromosome number of man is _____________
The number of chromosomes in a certain type of cell division is halved. This kind of cell division occurs in ______.
What are chromosomes?
How does colchicine act as mitotic poison? Is there any advantage of it?
Give a reason for the following:
Gametes must be produced by meiosis for sexual reproduction.
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
Chromosomes are the thickest and shortest in telophase.
Multiple Choice Question:
After mitotic cell division, a female human cell will have
Write the functional activity of the following structure:
Spindle fibers
Explain the structure of chromosomes with labelled diagram.
The thin thread-like structures found in the nucleus of each cell are called ______.
An inheritable change in the amount or the structure of a gene or a chromosome is 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 |
Define the following term:
Chromosome
In the human male, a sperm contains autosomes and ______.
