ï»¿ Which one of the following statements about the particular entity is true? from Biology Principles of Inheritance and Variation Class 12 Nagaland Board

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Class 10 Class 12

Which one of the following statements about the particular entity is true?

• Centromere is found in animal cell which produces ester during cell divison

• the gene for producing insulin is present in every body cell

• Nucleosome is formed of nucleotides

• DNA consists of a core of eight histones

C.

Nucleosome is formed of nucleotides

A scientist has analysed the human DNA sequence present in a human -mouse somatic cell hybrid line possessing a translocation involving human chromosome-II and X. This data indicates that the human insulin gene is located on the short arm of chromosome-II in everybody cell but is not expressed in all cells.

A scientist has analysed the human DNA sequence present in a human -mouse somatic cell hybrid line possessing a translocation involving human chromosome-II and X. This data indicates that the human insulin gene is located on the short arm of chromosome-II in everybody cell but is not expressed in all cells.

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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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What for symbols AA and Aa stand ?

AA : Homozygous dominant, Aa : Heterozygous dominant.
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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.

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Name one trait that does not blend.

Sex trait .
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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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