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Principles Of Inheritance And Variation

Question

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Down's syndrome occurs as a result of

trisomy

tetrasomy

autopolyploidy

allopolyploidy

Solution

A.

trisomy

Down's Syndrome is Trisomy of 21^st chromosome. It is characterized by mental retardation, short stature with stubby fingers and heart defects.

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Mention the phenomenon of pleiotropy by giving an example.

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Write down Mendel’s dihybrid Phenotypic ratio

Who were the rediscoverers of Mendelism ?

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