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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

In genetic engineering, a DNA segment (gene) of interest, is transferred to the host cell through a vector. Consider the following four agents (A-D) in the regard and select the correct option about which one or more of these can be used as a vector/vectors
A) A bacterium
B) Plasmid
C) Plasmodium
D) Bacteriophage

• A, B and D only

• A only

• A and C only

• B and D only

D.

B and D only

Plasmids are the extrachromosomal DNA found in bacterial cells. These are commonly used as vectors in genetic engineering programmes because these have the capacity of binding with eukaryotic DNA.
A bacteriophage is a virus that is parasitic within a bacterium. These also, are the important tools in genetic engineering as cloning vectors.

Plasmids are the extrachromosomal DNA found in bacterial cells. These are commonly used as vectors in genetic engineering programmes because these have the capacity of binding with eukaryotic DNA.
A bacteriophage is a virus that is parasitic within a bacterium. These also, are the important tools in genetic engineering as cloning vectors.

326 Views

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 ).
1012 Views

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