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Principles of Inheritance and Variation

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Biology

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12

What is Mendel’s monohybrid phenotypic ratio ?

Phenotypic ratio for monohybrid cross is 3 : 1.

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

Example : Sickle cell anaemia.

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

(i) Lethality : Sickle cell anaemia.

(ii) Multiple allelism : ABO blood groups.

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Write the genotypes of man with blood group A.

The genotypes of man with blood group A can be I^AI^A, or I^A I^O.

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What for symbols AA and Aa stand ?

AA : Homozygous dominant, Aa : Heterozygous dominant.

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