The condition in which only one allele of a pair is present is known as

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The condition in which only one allele of a pair is present is known as

A. Homozygous

B. Heterozygous

C. Hemizygous

D. Incomplete dominance

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How many meiosis will be required to produce 102 pollen-grains ?

A. 25

B. 25.6

C. 26

D. 26.5

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The segment of DNA which participates in crossing over is known as

A. recon

B. muton

C. criston

D. replicon

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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 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 chemical mutagen is

A. X-rays

B. UV-rays

C. $β$ -rays

D. 5-Bromo-Uracil

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The condition in which only one allele of a pair is present is known as

A. Homozygous

B. Heterozygous

C. Hemizygous

D. Incomplete dominance

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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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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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A child is bom with an extra chromosome in each of its cells. This is usually the result of

A. nondisjunction

B. crossing over

C. segregation

D. hybridization

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The science dealing with study of inheritance and variation is

A. Genetics

B. Evolution

C. Morphology

D. Cytology

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The genetic constitution of an organism is known as

A. Genome

B. Genepool

C. Genotype

D. Phenotype

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The term 'meiosis' was coined bv

A. Herting and Van Beneden

B. Sutton and Boveri

C. Hofmeister and Waldeyer

D. Farmer and Moore

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Which disease results from the genetic inability to synthesize a single enzyme ?

A. Diabetes

B. Phenylketonuria

C. Colour-blindness

D. Down's syndrome

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Reverse transcription was discovered by

A. Watson

B. Crick

C. Temin

D. Porter

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The crossing of a homozygous tall plant with a dwarf would yield plants in the ratio of

A. all heterozygous tall

B. two tall and two dwarf

C. one homozygous tall, two heterozygous tall and one homozygous dwarf

D. all homozygous dwarf.

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Linkage is

A. directly related to crossing over

B. same as translocation

C. inversely related to crossing over

D. opposite to segregation

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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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DNA duplication occurs in

A. meiosis only

B. meiosis II and mitosis

C. mitosis only

D. meiosis I and mitosis

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An offspring of two homozygous parents different from one another by alleles at only one gene locus is known as

A. monohybrid

B. dihybrid

C. trihybrid

D. backcross

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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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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

A. TT

B. Tt

C. tt

D. None of these

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Among the following which is a test cross?

A. TtxTt

B. TTxTT

C. TTxTt

D. Ttxtt

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Down's syndrome is an example of

A. monosomy

B. trisomy

C. triploidy

D. polyploidy

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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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Base substitutions from base analogues I are called

A. transitions

B. transversions

C. intragenic complimentation

D. intergenic complimentation

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When is the sex of an offspring decided

A. At ovulation

B. During meiosis

C. During cleavage

D. At fertilization

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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

A. $A B, R H^{+}$

B. $A B, R H^{-}$

C. $O, R H^{-}$

D. $O, R H^{+}$

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Albinism in com plants is best described as

A. lethal

B. sex-linked

C. inbred

D. dominance

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Exhibition of superiority by a hybrid over both of its parents is called

A. heterosis

B. hybridization

C. hypostasis

D. dominance

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A codon is a sequence of 3 nucleolides on

A. t-RNA

B. m-RNA

C. s-RNA

D. hn-RNA

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Accepted Answer

C. Hemizygous

The condition in which only one allele of a pair is present is known as

Correct Answer :

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