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Class 12BiologyPrinciples of Inheritance and VariationChromosomal disorders
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Who reported that Down's syndrome is due to an extra $21^{st}$ chromosome?

  • A
    $J$.$L$. Down $(1866)$
  • B
    Lejeune $(1959)$
  • C
    Klinefelter $(1942)$
  • D
    Huntington $(1872)$
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Class 12 Questions

Class 12

Biology Questions

Chapter

Principles of Inheritance and Variation

Subtopic

Chromosomal disorders

Similar Questions

Match the following columns:
Column-$I$ (Disorder) Column-$II$ (Ploidy)
$P$. Down's syndrome $I$. Sex chromosomal trisomy
$Q$. Klinefelter's syndrome $II$. Sex chromosomal monosomy
$R$. Turner's syndrome $III$. Autosomal trisomy

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If the somatic cells of a male contain one Barr body,what would be their genetic constitution?

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What is the chromosomal constitution in Klinefelter syndrome due to trisomy?

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Mental retardation in humans,associated with sex chromosomal abnormality,is usually due to:

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Down's syndrome is an example of

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