Related Questions
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How many meiosis will be required to produce 102 pollen-grains ?
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A codon is a sequence of 3 nucleolides on
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The chromosomal theroy of heredity implies that
A. chromosomes are composed of DNA and protein
B. genes are composed of chromosomes
C. organism cannot live withoutchromosomes
D. genes are located on the chromosomes and are transmitted to the next generation through them.
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Reverse transcription was discovered by
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The scientists who rediscovered the Mendel's laws are
C. Corren, Tschermark and Hugo de Vries
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Chromosomes exhibit minimum coiling during
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Exhibition of superiority by a hybrid over both of its parents is called
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The segment of DNA which participates in crossing over is known as
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A person meets with an accident and great loss of blood has occurred. There is no time to analyse his blood group. It is safe to transfuse blood of
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A child is bom with an extra chromosome in each of its cells. This is usually the result of
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The number of characters investigated by Mendel was
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When two genes are situated very close to each other in a chromosome
A. the percentage of crossing over between themis high
B. hardly any cross-overs detected
C. no crossing-over can ever take place between them
D. only double cross overs can take place between them.
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The science dealing with study of inheritance and variation is
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The genetic constitution of an organism is known as
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If an individual does not breed true for its characters, it is called
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Some people experience PTC paper on tongue as bitter, others as tasteless. This character is hereditary in nature. Suppose T stands for dominant gene and t for recessive gene, the genetic make up of a person who cannot taste is
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A colour-blind man marries the daughter of a colour-blind person. In their progeny
A. none of her daughters are colour-blind
B. all her sons are colour-blind
C. all her daughters are colour-blind
D. half of her sons are colour-blind
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A pure tall pea plant was reared in a soil poor in nutrition and reached the size of a pure dwarf pea plant If the plant is selfed, the genotype in the Fi generation is most likely to be
B. 50% tall and 50% dwarf
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When is the sex of an offspring decided
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Diakinesis is characterised by
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An offspring of two homozygous parents different from one another by alleles at only one gene locus is known as
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A chemical mutagen is
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Klinefelter's syndrome is developed when the chromosome in male is
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The crossing of a homozygous tall plant with a dwarf would yield plants in the ratio of
B. two tall and two dwarf
C. one homozygous tall, two heterozygous tall and one homozygous dwarf
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Lethal genes are those which
A. cause the death of the organism in which they are present
B. cause the death of the homozygous infant being formed
C. cause the death of heterozygous infant being formed
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Linkage is
A. directly related to crossing over
C. inversely related to crossing over
D. opposite to segregation
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Down's syndrome is an example of
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Albinism in com plants is best described as
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In the Operon concept, the regulator gene regulates chemical reactions in the cell by
A. inhibiting transcription of m-RNA
B. inactivating enzymes in the reaction
C. inhibiting the substrate in the reaction
D. inhibiting the migration of m-RNA into cytoplasm
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The first person to induce mutations was