Point mutation involves
insertion
change in the single base pair
duplication
duplication
B.
change in the single base pair
The point mutations involve alterations in the structure of gene by altering the structure of DNA. Point mutations are of two types- (i) base pair substitution and (ii) Frameshift substitution.
Insertion is the addition of one of more nitrogenous bases to a nucleotide chain.
Duplication is the presence of one block of genes more than once in the haploid component.
Deletion is the removal of one or more nitrogenous bases from a nucleotide chain.
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
Select the correct statement from the ones given below with respect to dihybrid cross.
Tightly linked genes on the same chromosome show higher recombinations
Genes far apart on the same chromosome show very few recombinations
Genes loosely linked on the same chromosome show similar recombinations as the tightly linked ones.
Genes loosely linked on the same chromosome show similar recombinations as the tightly linked ones.
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
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
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
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
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
Which one of the following symbols and its representation, used in human pedigree analysis is correct?
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
