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Principles Of Inheritance And Variation

Question

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The trisomy for 21^st chromosome is called

Down's syndrome

Turner's syndrome

Sickle cell anaemia

Klinefelter's syndrome

Solution

A.

Down's syndrome

Trisomy of 21^st chromosome is known as Down's syndrome.

Turner's syndrome is the non- disjunction of sex chromosome, that is, 2n = 45.

Klinefelter's syndrome is the presence of one extra chromosome, that is, 2n = 47.

Sickle cell anaemia is a disease in which RBCs are sickle in shape. It is a molecular gene mutation of gene Hb^A.

Some More Questions From Principles of Inheritance and Variation Chapter

Name one trait that does not blend.

Give one example of genetic trait for each of the following in humans : (i) Lethality (ii) Multiple allelism.

What for symbols AA and Aa stand ?

Mention the phenomenon of pleiotropy by giving an example.

Name the plant that shows incomplete dominance in respect of the colour of its flower.

Write the genotypes of man with blood group A.

What is Mendel’s monohybrid phenotypic ratio ?

Write down Mendel’s dihybrid Phenotypic ratio

Who were the rediscoverers of Mendelism ?

What are the real determinants of what an organism will become ?

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