The possibilities of hereditary and evolutionary changes are greatest in species that reproduce by
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Reverse transcription was discovered by
A pure tall pea plant was reared in a soil poor in nutrition and reached the size of a pure dwarf pea…
The nuclear membrane completely disappears during
Which one of the following chemical characteristics is not common to all living beings ?
Lethal genes are those which
In humans, an example of sex-linked trait is
Down's syndrome is an example of
A functional unit of a gene which specifies synthesis of one poly-peptide is known as
Klinefelter's syndrome is developed when the chromosome in male is
Which disease results from the genetic inability to synthesize a single enzyme ?
How many meiosis will be required to produce 102 pollen-grains ?
Among the following which is a test cross?
The scientists who rediscovered the Mendel's laws are
When is the sex of an offspring decided
A colour-blind man marries the daughter of a colour-blind person. In their progeny
Chromosomes exhibit minimum coiling during
A child is bom with an extra chromosome in each of its cells. This is usually the result of
Mutations which are not dominant are not lost by a gene pooL This is known as
The first person to induce mutations was
Diakinesis is characterised by
A giant chromosome having many chromo-nemata lying side by side all along their length is called
The science dealing with study of inheritance and variation is
Albinism in com plants is best described as
Crossing over in meiosis occurs in
The condition in which only one allele of a pair is present is known as
An offspring of two homozygous parents different from one another by alleles at only one gene locus…
Some people experience PTC paper on tongue as bitter, others as tasteless. This character is hereditary…
Transfer of a gene or genes through a virus is called
The best method to determine whether an individual is homozygous or heterozygous is
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