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

A human being suffering from Down's Syndrome shows trisomy of `21^(st)` chromosome. Mention the cause of this chromosomal abnormality.

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The cause of this genetic disorder is the presence of an additional copy of the chromosome number 21 trisomy of 21) due to nondisjunction.
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TRUEMAN BIOLOGY-GENETICS AND EVOLUTION -SECTION-A
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  2. Name one autosomal dominant and one autosomal recessive. Mendelian dis...

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  4. A pedigree chart given here, presents a particular generation which sh...

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  5. In order to obtain the F(1)-generation Mendel pollinated a pure-breedi...

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  6. "Genes contain the information that is required to express a particula...

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  7. How are alleles of particular gene differ from each other? Explain its...

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  8. For the experssion of traits genes provide only the potentiality and t...

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  9. A, B, D are three independently assorting genes with their recessive a...

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  10. Sometimes cattle or even humen beings give birth to their young ones t...

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  11. In a nucleus, the number of RNA nucleoside triphosphates is 10 times m...

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  12. Name the enzyme and state its property that is responsible for continu...

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  13. what does carbohydrate mean?

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  14. Mention the type of evolution that has brought the similarity as seen ...

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  15. Study the ladder of human evolution given above and answer the followi...

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  16. Coelacanth was caught in 1938 in South Africa. Why is it very signific...

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  17. Name the common ancestor of the great apes and man.

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  18. How do we compute the age of a fossils ?

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  19. In a certain population, the frequency of three genotypes is as follow...

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  20. By what Latin name, the first Hominid was known?

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