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प्रश्न
What is the importance of meiosis in creating variations?
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उत्तर
During meiosis, the exchange of chromosomal material takes place between the non-sister chromatids forming new combinations. These new combinations give rise to variations which result in the evolution of species and even in the origin of new species.
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संबंधित प्रश्न
Chromosomes get aligned at the centre of the cell during:
A. Metaphase
B. Anaphase
C. Prophase
D. Telophase
Give appropriate biological or technical terms for the following :
The condition in which a pair of chromosomes carries similar alleles of a particular character.
Correct the following statement if there is any mistake:
If there are 46 chromosomes in a cell, there will be 23 chromatin fibres inside the nucleus during interphase.
Choose the best option out of the four alternatives a, b, c and d
Question 1:
The number of chromosomes in a certain type of cell division is halved. This kind of cell
division occurs in.
(a) Only testis
(b) Only ovary
(c) Both ovary and testis
(d) All body cells
Write a sentence of the following:
Telomere
Give a reason for the following:
Gametes must be produced by meiosis for sexual reproduction.
Differentiate between
Chromatin and Chromosome.
Explain the Term Spindle
Explain the Term Chromosomes
Give Technical Terms
The stage when sister chromosomes separate from their paired condition.
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.
Give Reason:
The Law of independent assortment holds good for the gene pairs that occur in different pairs of chromosomes.
Give the example of X- monosomy you have studied.
The number of chromosomes found in human beings is ______.
The loss of one or more chromosomes in ploidy is called ______.
Explain the structure of a chromosome.
Define the following term:
Chromosome
