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Down's syndrome in humans is due to...

Down's syndrome in humans is due to

A

Two 'Y' chromosomes

B

Three 'X' chromosomes

C

Three copies of chromosome 21

D

Monosomy

Text Solution

Verified by Experts

The correct Answer is:
C
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AAKASH INSTITUTE-PRINCIPLES OF INHERITANCE AND VARIATION-Assignment (SECTION-C) Previous Years Questions
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  2. In our society women are balmed for producing female children. Choose ...

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  3. Down's syndrome in humans is due to

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  4. The variation/difference in the offspring of a species from their pare...

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  5. If two pea plants having red (dominant) coloured flowers with unknown...

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  6. Walter sutton is famous for his contribution to :

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  7. A polygenic trait is controlled by 3 genes A, B and C. In a cross AaBb...

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  8. The chromosome constitution 2n-2 of an organism represents :

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  9. Mendel's principle of segregation means that the germ cells always rec...

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  10. Absence of one sex chromosome causes

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  11. Chimera is produced due to

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  12. Haploids are more suitable for mutation studies than the diploids. Thi...

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  13. Which one of the following conditions in humans is correctly matched w...

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  14. Genes which are cofined to differential region of the Y-chromosome onl...

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  15. The colour blindness is more likely to occur in males than in females ...

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  16. Albinism is a congenital disorder resulting from the lack of the enzym...

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  17. An abnormal human male phenotype involving an extra Y-chromosome (XYY)...

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  18. The phenomenon, in which an alleles of one gene suppresses the activit...

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  19. Barr body in mammals represent

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  20. Two dominant independently assorting genes react with each other. They...

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