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What is the basis of Down's syndrome dis...

What is the basis of Down's syndrome disorder?

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It is an autosomal aneuploidy or 21-trisomy. In this case the egg possesses 24 chromosome instead of 23 and the offspring has 47 chromosomes. (45 + XY male, 45 + XX in female) instead of 46
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OSWAAL PUBLICATION-PRINCIPLES OF INHERITANCE AND VARIATIONS -(TOPIC 2 ) (SEX DETERMINATION AND GENETIC DISORDERS (SHORT ANSWER TYPE QUESTIONS-I))
  1. What is the karyotype in Turner's syndrome ? Mention two symptoms of t...

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  2. What is sex linked inheritance? Give an example.

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  3. What is Y linked inheritance? Give an example.

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  4. Drosophila melanogaster is a model organism in genetic studies. Justif...

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  5. A normal visioned woman, whose father is colour blind, marries a norma...

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  6. If a father and son are both defective in red-green color vision, is i...

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  7. How is a child affected if it has grown from the zygote formed by an X...

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  8. Sex determination is based on particular chromosomes in both birds and...

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  9. What is the cause of Phenylketonuria. Explain the disorder.

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  10. Differentiate: autosomes and allosomes.

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  11. The human male never passes on the gene for haemophillia to his son. W...

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  12. Name the animal in which sex is determined by number of chromosomes. W...

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  13. What is the basis of Down's syndrome disorder?

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  14. Study the given pedigree chart and answer the questions that follow. ...

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  15. Study the given pedigree chart and answer the questions that follow. ...

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  16. Explain the pattern of inheritance of haemophilia in humans. Why is th...

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  17. The male fruit fly and female fowl are heterogametic while the female ...

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  18. Give the chromosomal constitution and the resulting sex in each of the...

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  19. Write any four abnormalities of Down syndrome.

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