Advertisements
Advertisements
प्रश्न
What is chromosomal aberration? Give any two types of aberrations found in the population.
Advertisements
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
How are the areas of study – evolution and classification – interlinked?
Explain how, characteristics (or traits) are inherited through genes.
A gradual change, over a long period, in a form of life is known as :
(a) erosion
(b) evolution
(c) revolution
(d) evaluation
Out of the wing of a bird, wing of an insect and the wing of a bat :
which two are analogous organs?
Read the following statement and justify same in your own words with the help of suitable example.
Human evolution began approximately 7 crore years ago.
Define Organic evolution.
Short answer question.
Write a note on Genetic drift.
____________ results in variation in gene frequencies within population by chance rather than by natural selection.
Evolution occurs as a result of mutations in ______.
The idea of mutation was brought forth by:
