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Principles of Inheritance and Variation — BIOLOGY STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceBIOLOGYPrinciples of Inheritance and Variation3 Marks
Question
Differentiate between monosomy and trisomy. Give an example of each from human geneties.
✓

Answer

S.No
Monosomy
Trisomy
1.
It is the condition where a diploid individual lacks one member of any one pair of chromosomes.
It is the condition where a diploid individual has an additional copy of a chromosome.
2.
The individual has (2n - 1) number of chromosomes.
e.g. Turner's syndrome, i.e. monosomy of X-chromosome.
The individual has (2n + 1) number of chromosomes.
eg. Down's syndrome, i.e. trisomy of 21st chromosome.

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