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

• Nucleosome is formed of nucleotides

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

• A and C only

The fruit fly, Drosophila melanogaster was found to be very suitable for experimental verification of chromosomal theory of inheritance by Morgan and his colleagues because

• It reproduces parthenogenetically

• a single mating produces two young files

• smaller female is easily recognisable from larger male

• smaller female is easily recognisable from larger male

Study the pedigree chart of a certain family given below and select the correct conclusion which can be drawn for the character.

• The female parent is heterozygous

• The parents could not have a had a normal daughter for this character

• The trait under study could not be colour blindness

• The trait under study could not be colour blindness

The bacterium Bacillus thuringiensis is widely used in contemporary biology as a/an

• Indicator of water pollution

• insecticide

• agent for the production of dairy products

• agent for the production of dairy products

Point mutation involves

• insertion

• change in the single base pair

• duplication

• duplication

Which one of the following is commonly used in the transfer of foreign DNA into crops plants?

• Trichoderma hazianum

• Meloidogyne incognita

• Agrobacterium tumefaciens

• Agrobacterium tumefaciens

Which one of the following condition in humans is correctly matched with tis chromosomal abnormality /linkage?

• Klinefelter's syndrom-44 autosomes + XXX

• Colourblindness- Y-linked

• Erythroblastosis foetails - X-linked

• Erythroblastosis foetails - X-linked

189.

Haploids are more suitable for mutation studies than the diploids. This is because 

• Haploids are reproductively more stable than diploids

• mutagens penetrate in haploids more effectively than is diploids

• haploids are more abundant in nature than diploids

• haploids are more abundant in nature than diploids

A human male produces sperms with the genotypes AB, Ab, aB, and ab pertaining to two diallelic characters in equal proportions. What is the corresponding genotype of this person?

• AaBb

• AaBB

• AABb

• AABb