1. Tardigrade
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  3. Biology
  4. Assertion: Chromosomal aberrations are caused by a break in the chromosome or its chromatid. Reason: Duplication, deficiency, transversion and translocations are the result of chromosomal aberrations.

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Q. Assertion: Chromosomal aberrations are caused by a break in the chromosome or its chromatid.
Reason: Duplication, deficiency, transversion and translocations are the result of chromosomal aberrations.

AIIMSAIIMS 1994Principles of Inheritance and Variation

Solution:

Variations in the structure and number of chromosomes are called chromosomal aberrations. Strucural changes can be of following types : (i) deficiency, which involves loss of a part of chromosome, (ii) duplication, which involves addition of a part chromosome, (iii) inversion which involves a reverse order of the genes in a part of chromosome and (iv) translocation, which involves exchange of segments between non homologous chromosomes.