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Down's syndrome is due to...

Down's syndrome is due to

A

crossing over

B

linkage

C

sex-linked inheritance

D

non-disjunction of chromosomes

Text Solution

Verified by Experts

The correct Answer is:
D
None-disjunction of 21st chromosome during oogenesis is the cause of Down's syndrome. It is also called mongolian syndrome.
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NEET PREVIOUS YEAR (YEARWISE + CHAPTERWISE)-PRINCIPLES OF INHERITANCE AND VARIATION -MCQ
  1. In human being ,45 chromosomes (44+ XO) cause:

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  2. A colourblind mother and normal father would have

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  3. Down's syndrome is due to

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  4. When a certain character is inherited only through female parent it pr...

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  5. Out of 8 ascospores formed in Neutrospora the arrangement is 2a : 4a :...

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  6. An organism with two identical alleles for a given trait is:

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  7. Segregation of Mendelian factors (no linkage no crossing over) occurs ...

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  8. An allele is dominant if it is expressed in:

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  9. One gene pair hides the effect of another. The pheomenon is:

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  10. RR (red) Antirrhinum majus is crossed with white (rr) one. Offsprings ...

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  11. The allele which is unable to express its effect in the presence of an...

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  12. The contrasting pairs of factors in Mendelian crosses are called

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  13. First geneticist/father of genetics was

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  14. Mendel's last law is

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  15. A dihybrid condition is

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  16. A colour blind girl is rare because she will be only when :

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  17. Blue eye colour is recessive to brown eye colour. A brown eyed man who...

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  18. Multiple alleles control inheritance of

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  19. Which one is a hereditary disease?

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  20. Haemophilia is more common in males because it is a

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