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प्रश्न
How does colchicine act as mitotic poison? Is there any advantage of it?
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
Fill in the blank
The _______ (s) are surrounded by radiating rays called aster
State the difference between:
Chromosome and chromatid:
Choose the correct answer:
Chromosomes number is halved in _____________
Choose the correct answer:
Centromere is related to _______________
Choose the correct answer:
The term 'chromosome' was coined by ___________
Synthesis phase in the cell cycle is called so for the synthesis of more of
What is the importance of meiosis in creating variations?
Complete the following sentence with appropriate word :
Chromosomes are _________ material.
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.
Name the following:
Cells having a single set of chromosomes.
Long answer type question.
Describe the different types of chromosomes.
Explain the structure of chromosomes with labelled diagram.
An inheritable change in the amount or the structure of a gene or a chromosome is called ______.
Identify the TRUE statements with respect to aneuploidy.
- When the chromosome number is not the exact multiple of the haploid set, it is described as aneuploidy.
- Aneuploidy is only addition of one or more chromosome(s) to the total number of chromosomes in a cell.
- Aneuploidy is further classified as hypoploidy and hyperploidy.
Read the following statements and select the correct option.
Statement I: The densely packed transcriptionally active, light staining region of chromatin is known as 'Heterochromatin'.
Statement II: The loosely packed, dark staining transcriptionally inactive region of chromatin is known as 'Euchromatin'.
A male gorilla has 48 chromosomes in each of its body cells. How many chromosomes will each of the sperms have?
The two non-sister chromatids of a paired chromosome are attached to each other at ______ during the process of crossing over.
Distinguish between the following pair:
Karyotype and Karyokinesis
