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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
APPEARS IN
संबंधित प्रश्न
What is the number of chromosomes in the gametes of human beings?
Correct the following statement if there is any mistake:
Genes are specific sequences of bases on a chromosome .
What are genes?
Fill in the blank
The _______ (s) are surrounded by radiating rays called aster
Choose the correct answer:
In an interphase cell chromosome are as _____________
Choose the correct answer:
Chromosomes number is halved in _____________
Choose the correct answer:
Chromosomes number is halved in ____________
Write a sentence of the following:
Telomere
Choose the correct answer:
A 'V' shaped chromosomes has to _____________
What is the importance of meiosis in creating variations?
State how does meiosis maintains chromosome number in a species.
What is the importance of meiosis?
Give a reason for the following:
Gametes must be produced by meiosis for sexual reproduction.
(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.
Name the following:
The part of the cell associated with heredity.
Give Technical Terms
The stage at which chromosomes occurs reach the opposite poles.
Long answer type question.
Describe the different types of chromosomes.
In humans, the sex chromosome complement is
Some of the chromosomes have an elongated knob-like appendages known as telomere.
The two non-sister chromatids of a paired chromosome are attached to each other at ______ during the process of crossing over.
