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प्रश्न
What is chromosomal aberration? Give any two types of aberrations found in the population.
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उत्तर
- Definition: The structural and morphological change in chromosomes due to rearrangement is called chromosomal aberrations. It changes the gene arrangement (order or sequence) that results in the variation. Chromosomal aberrations occur due to the following reasons:
- Deletion: Loss of genes from chromosome.
- Duplication: Genes are repeated or doubled in number on chromosomes.
- Inversion: A particular segment of the chromosome is broken and gets reattached to the same chromosome in an inverted position due to 1800 twist. There is no loss or gain of the gene complement of the chromosome.
- Translocation: Transfer (transposition) of a part of a chromosome or a set of genes to a non-homologous chromosome is called translocation. It is affected naturally by the transposons present in the cell.
संबंधित प्रश्न
Where are the genes located?
Explain how, characteristics (or traits) are inherited through genes.
Which of the following gas was not present in early earth atmosphere?
(a) Ammonia
(b) Oxygen
(c) Hydrogen sulphide
(d) Methane
Scientists believe that all life originated in :
(a) the sea
(b) the soil
(c) the ground
(d) the air
A population of red beetles lives in green bushes in a garden. Once during the process of breeding, a green beetle is produced.
(a) State whether the change in colour of beetle is a process of evolution or not.
(b) Can the new colour of green beetle be passed on to its next generations?
(c) What will be the advantage (if any) of the green colour to the beetle?
(d) State whether the production of green colour involved a change in genetic material or not.
Name any three types of postmating isolating mechanisms.
Evolution occurs as a result of mutations in ______.
Genetic drift is change of:
Which of the following is the correct pair?
Define the following term:
Evolution
