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Principles of Inheritance and Variation

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Question

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Name one trait that does not blend.

Solution

Sex trait .

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Question

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

Solution

(i) Lethality : Sickle cell anaemia.

(ii) Multiple allelism : ABO blood groups.

Question

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What for symbols AA and Aa stand ?

Solution

AA : Homozygous dominant, Aa : Heterozygous dominant.

Question

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Mention the phenomenon of pleiotropy by giving an example.

Solution

Pleiotropy. When one gene controls more than one phenotypic character it is termed as pleiotropy.

Example : Sickle cell anaemia.

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