A child is bom with an extra chromosome in each of its cells. This is usually the result of
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When two genes are situated very close to each other in a chromosome
Base substitutions from base analogues I are called
DNA duplication occurs in
Which one of the following chemical characteristics is not common to all living beings ?
Crossing over in meiosis occurs in
The condition in which only one allele of a pair is present is known as
How many meiosis will be required to produce 102 pollen-grains ?
The best method to determine whether an individual is homozygous or heterozygous is
Colour blindness is caused due to
Linked genes may be separated by the process of
The first person to induce mutations was
A codon is a sequence of 3 nucleolides on
A person meets with an accident and great loss of blood has occurred. There is no time to analyse…
Which disease results from the genetic inability to synthesize a single enzyme ?
A functional unit of a gene which specifies synthesis of one poly-peptide is known as
The chromosomal theroy of heredity implies that
The number of characters investigated by Mendel was
Among the following which is a test cross?
Diakinesis is characterised by
Some people experience PTC paper on tongue as bitter, others as tasteless. This character is hereditary…
The segment of DNA which participates in crossing over is known as
A chemical mutagen is
The scientists who rediscovered the Mendel's laws are
Mutations which are not dominant are not lost by a gene pooL This is known as
An offspring of two homozygous parents different from one another by alleles at only one gene locus…
The genetic constitution of an organism is known as
Lethal genes are those which
Transfer of a gene or genes through a virus is called
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