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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
Choose the odd one out and name the category to which it belongs.
Centrosome, Cell wall, Cell membrane, Large Vacuole.
Choose the correct answer:
Chromosomes appear at equator in ____________
Choose the correct answer:
Minimum coiling in chromosome is at ______________
Choose the correct answer:
If after karyokinesis, cytokinesis does not occur, then result would be _____________
Choose the correct answer:
Chromosomes are thin and thread like at __________
State how does meiosis maintains chromosome number in a species.
Give a reason for the following:
Gametes must be produced by meiosis for sexual reproduction.
Give Reasons for the following
Chromosomes are the carriers of heredity.
Explain the Term Spindle
Name the following:
The part of the cell associated with heredity.
Give Technical Terms
The stage at which chromosomes occurs reach the opposite poles.
Multiple Choice Question:
The period between two successive mitotic divisions is
Name the following:
The pattern of arrangement of genes along a chromosome.
Describe the structure of sex chromosomes with the help of labelled diagram.
The thin thread-like structures found in the nucleus of each cell are called ______.
Some of the chromosomes have an elongated knob-like appendages known as telomere.
Which of the following type of chromosomes has only one telomere?
A male gorilla has 48 chromosomes in each of its body cells. How many chromosomes will each of the sperms have?
Define the following term:
Chromatid
Which of the following describes the correct type of chromosome?
X- chromosome: A : : Y-chromosome: В
