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Down's syndrome is characterised by...

Down's syndrome is characterised by

A

19 trisomy

B

21 trisomy

C

One X-chromosome

D

Two X and one Y-chromosome

Text Solution

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The correct Answer is:
B
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ARIHANT NEET-HUMAN GENETICS-Chapter Exercise (c) Medical entrances gallery (Collection of questions asked in NEET & Various Medical Entrance Exams)
  1. Find out the mismatched pair

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  2. Which one of the following statement is relevant to sex linked charact...

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  3. Down's syndrome is characterised by

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  4. An abnormal human baby with XXX sex chromosomes was born due to

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  5. Which of the following is correct?

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  6. In sickle-cell anaemia substitution of glutamic acid molecule by valin...

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  7. If a boy's father has haemophilia and mither is heterozygous what is t...

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  8. A human female with turner's syndrome

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  9. A man whose father was colourblind marries a woman, who had a colourbl...

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  10. A couple both carriers of sickle cell anaemia planning to get married,...

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  11. Which of the following is correctly matched?

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  12. A person affected with phenylketonuria lacks an enzyme that converts t...

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  13. In sickle cell anaemia, the sequence of amino acid from first to seven...

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  14. Anish is having colour blindness and married to Sheela, who is not col...

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  15. The genotype of a person suffering from Klinefelter's symdrome is

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  16. In alpha thalasssemia the gene HBAI is located on chromosome

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  17. Sickle-cell anaemia is caused due to the substitution of :

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  18. Down's syndrome is an example

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  19. In down's syndrome (Mongolism), each cell has how many chromosomes?

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  20. In the given pedigree, the shaded individuals are homozygous recessive...

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