Mutations can be induced with from Biology Principles of Inheritance and Variation Class 12 Nagaland Board
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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

Mutations can be induced with

  • IAA

  • ethylene

  • gamma radiations

  • infra red radiations


C.

gamma radiations

Gamma radiations are ionising radiation and are physical mutagens. They are used as mutagens in such materials, where the nucleus is deep-seated, e.g, seeds, stem cuttings, etc. 'Sharbati Sonora' variety of wheat has been developed by gamma radiations on 'Sonora- 64' variety (Mexican dwarf wheat variety).

Gamma radiations are ionising radiation and are physical mutagens. They are used as mutagens in such materials, where the nucleus is deep-seated, e.g, seeds, stem cuttings, etc. 'Sharbati Sonora' variety of wheat has been developed by gamma radiations on 'Sonora- 64' variety (Mexican dwarf wheat variety).

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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.

815 Views

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)

Or 

Mirabilis jalapa (Four-O- Clock plant ).
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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.

825 Views

What for symbols AA and Aa stand ?

AA : Homozygous dominant, Aa : Heterozygous dominant.
772 Views

Name one trait that does not blend.

Sex trait .
1181 Views