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प्रश्न
How does colchicine act as mitotic poison? Is there any advantage of it?
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उत्तर
Colchicine is an alkaloid obtained from Autumn crocus (Colchicum autumnale). It inhibits the formation of mitotic spindle. As a result, chromosomes duplicate but they remain within the same cell, increasing in number (endoduplication). Such cells are called polyploid cells.
Its advantage is that plant breeders have used colchicine-induced polyploidy as a means of producing variants of agricultural and horticultural crops.
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संबंधित प्रश्न
Choose the ODD one out from the following terms given and name the CATEGORY to which the others belong
Centrosome.Cell wall, Cell membrane, Large vacuoles
Give appropriate biological or technical terms for the following :
The condition in which a pair of chromosomes carries similar alleles of a particular character.
The Chromatin material is formed forms of ______.
What is the difference between chromatin fibre and chromosome?
Correct the following statement if there is any mistake:
Genes are specific sequences of bases on a chromosome .
Fill in the blank
The _______ (s) are surrounded by radiating rays called aster
Mention the contribution of the scientist given below in the study of chromosome:
Sutton and Boveri
Name the following:
Microtubules form the bipolar spindle in which stage.
Complete the following sentence with appropriate word :
Chromosomes are _________ material.
Multiple Choice Question:
After mitotic cell division, a female human cell will have
Complete the following sentence with appropriate word:
The chromosomal theory of inheritance was proposed by ____________in 1902.
Column ‘II’ is a list of items related to ideas in Column ‘I’. Match the term in Column ‘II’ with a suitable idea given in Column ‘I’.
| Column I | Column II |
| Genetics | Chromosomes are similar in size and shape. |
| Autosomes | The alternative forms of a gene. |
| Recessive gene | Study of laws of inheritance of characters |
| Allele | A gene that can express only when in a similar pair. |
| Homologous chromosomes | Chromosomes are other than the pair of sex chromosomes. |
The number of chromosomes found in human beings is ______.
Explain the structure of a chromosome.
Which of the following type of chromosomes has only one telomere?
Differentiate between X-chromosome and Y-chromosome with reference to –
- length of non-homologous regions
- type as per the position of the centromere
Small swellings on the surface of the chromosome are called______.
Define Aneuploidy.
