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प्रश्न
What is chromosomal aberration? Give any two types of aberrations found in the population.
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
Why are traits acquired during the life-time of an individual not inherited?
What is meant by dominant genes and recessive genes? Give one example of each.
"Only variations that confer an advantage to an individual organism will survive in a population". Do you agree with this statement? Give reason for your answer.
Which of the following gas was not present in early earth atmosphere?
(a) Ammonia
(b) Oxygen
(c) Hydrogen sulphide
(d) Methane
Write short notes based upon the information known to you.
Evolution
Multiple choice question.
Gene frequency in a population remain constant due to –
Very short answer question.
Define the Gene frequency
Which one of the following was not given by Darwin's theory of evolution?
Had Darwin been aware of Mendel’s work, would he been able to explain the origin of variations. Discuss.
Define the following term:
Evolution
