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Principles of Inheritance and Variation

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12

Which one of the following is a wrong matching of a microbe and its industrial product, while the remaining three are correct? 

  • Yeast - statins

  • Acetobacter aceti - acid

  • Clostridium Butulicum - lactic acid

  • Aspergillus niger  - citric acid


Clostridium Butulicum - lactic acid

Clostridium butulicum forms butyric acid

Clostridium butulicum forms butyric acid

Mention the phenomenon of pleiotropy by giving an example.

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

Example : Sickle cell anaemia.

What for symbols AA and Aa stand ?

AA : Homozygous dominant, Aa : Heterozygous dominant.

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

The plany which shoes incomplete dominace in respect of the colour of its flower is -

Snapdragron ( Antirrhinum majus)


Mirabilis jalapa (Four-O- Clock plant ).

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.

Name one trait that does not blend.

Sex trait .