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

Gujarat BoardEnglish MediumSTD 12 ScienceBIOLOGYPrinciples of Inheritance and Variation5 Marks
Question
How does a chromosomal disorder differ from a Mendelian disorder?
✓

Answer

S. No.
Mendelian disorder
Chromosomal disorder
(i)
This disorder is mainly due to alteration or mutation in the single gene.
This disorder is caused due to absence or excess or abnormal arrangement of one or more chromosomes.
(ii)
This follows Mendel’s principles of inheritance.
This does not follow Mendel’s principles ofinheritance.
(iii)
This may be recessive or dominant in nature.
This is always dominant in nature.
(iv)
For example, haemophilia, sickle–cell anaemia.
For example, Turner’s syndrome.

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