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प्रश्न
Answer the following question in your own words.
What is meant by ‘chromosome’?
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उत्तर
The structure in the nucleus of cells that carries the hereditary characteristics is called the chromosome. It is made up mainly of nucleic acids and proteins. During cell division chromosomes can be clearly seen under the compound microscope. ‘Genes’ which contain the information about hereditary characteristics in coded form are located on chromosomes. Each species has a specific number of chromosomes.
Each chromosome is made up of DNA and it appears dumbell-shaped midway during cell division. There is a constricted region on each chromosome. It is called the ‘Primary constriction’ or ‘Centromere’. This divides the chromosome into two parts. Each part is called an ‘arm’. The centromere has a specific position in each chromosome.
Organization of chromosome
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संबंधित प्रश्न
The Chromatin material is formed forms of ______.
What is the difference between chromatin fibre and chromosome?
Humans have 46 chromosomes. Their sperms and eggs will have ______ chromosomes each.
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:
Minimum coiling in chromosome is at ______________
Choose the correct answer:
A 'V' shaped chromosomes has to _____________
Differentiate between
Chromatin and Chromosome.
Differentiate between
Cytokinesis in plant and animal cell
Explain the Term Spindle
Name the following:
Microtubules form the bipolar spindle in which stage.
Name the following:
The diploid number for cell of man.
Multiple Choice Question
Chromosomal aberrations are caused by:
What is allosome?
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 |
What' does 'P' and 'Q' represent in the following diagram of X and Y chromosomes? Select the correct option representing, its appropriate description.
Normally, genes occur in a pair of chromosome, but genes of X and Y chromosomes shows different gene loci indicating ______.
Define the following term:
Chromatid
In the human male, a sperm contains autosomes and ______.
