Related Questions
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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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A giant chromosome having many chromo-nemata lying side by side all along their length is called
D. super numerary chromosome
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The possibilities of hereditary and evolutionary changes are greatest in species that reproduce by
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Linked genes may be separated by the process of
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Albinism in com plants is best described as
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Chromosomes exhibit minimum coiling during
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Among the following which is a test cross?
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Which one of the following chemical characteristics is not common to all living beings ?
A. Similar triplet codes for amino acids
B. Energy is stored by high energy rich phosphate bonds
C. Types of protein present in the body.
D. Ribosomes act at sites of protein synthesis
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The science dealing with study of inheritance and variation is
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Reverse transcription was discovered by
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If an individual does not breed true for its characters, it is called
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A codon is a sequence of 3 nucleolides on
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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 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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Colour blindness is caused due to
A. deficiency of vitamic C
B. sex-linked abnormality
C. absence of rods in retina
D. absence of visual purple in retina
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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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In a monohybrid cross the Fi ratio of a backcross is
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The term 'meiosis' was coined bv
A. Herting and Van Beneden
C. Hofmeister and Waldeyer
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Which disease results from the genetic inability to synthesize a single enzyme ?
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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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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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Dyad is
A. a pair of homologous chromosomes
B. a pair of non-homologous chromosomes
C. a pair of sister chromosomes
D. a pair of non-sister chromosomes
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The segment of DNA which participates in crossing over is known as
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How many meiosis will be required to produce 102 pollen-grains ?
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When is the sex of an offspring decided
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The scientists who rediscovered the Mendel's laws are
C. Corren, Tschermark and Hugo de Vries
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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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The condition in which only one allele of a pair is present 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