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A human being suffering from Down's synd...

A human being suffering from Down's syndrome shows trisomy of 21st t chromosome. Mention the cause of this chromosomal abnormality.

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Is ic caused by the presence of an extra copy of the 21st chromosome due to non disjunction of 21st autosomal chromosme during meisis.
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PRADEEP-PRINCIPLES OF INHERITANCE AND VARIATION -NCERT EXERCISES ADDITIONAL QUESTIONS (VERY SHORT ANSWER QUESTION )
  1. How many chromosomes a peso with Turner's syndrome has?

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  2. Which extra chromosome causes Klinefelter's syndrome?

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  3. Name one autosomal dominant and one autosomal recessive Mendelian diso...

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  4. A human being suffering from Down's syndrome shows trisomy of 21st t c...

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  5. Female heterogamy is found in (A) Birds (b)Grasshopper (C) Both (...

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  6. Male heterogamy is found is (a) Drosophilia (b)Humans (c) Grasshopper...

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  7. Define point mutation

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  8. What is gene pool ?

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  9. By which process there is a gain of segment of DNA which results in al...

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  10. Colour blindess is a recessive sex-linked trait in which the eye fails...

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  11. A man blames his wife for giving birth to a female child. Who is respo...

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  12. What is mutanges?

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  13. Write the genotype of offsprings produced between a homozygous blue ey...

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  14. Name the gentic disorder caused due to the presence of extra chromosom...

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  15. Down's syndrome is due to (a) Linkage (b) Sex-linked inheritance (c)...

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  16. A geneticist interested in studying variations and patterns of inherit...

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  17. How many chromosomes do drones of honeybee possess ? Name the type of ...

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  18. A male honeybee has 16 chromosomes whereas, its female has 32 chromoso...

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  19. Name the type of cross that would help to find the genotype of a pea ...

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  20. Write the sex of a human having XXY chromosomes with 22 pairs of autos...

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