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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

D. all of the above

Correct Answer :

D. all of the above


Related Questions

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Diakinesis is characterised by

A. crossing over

B. synapse

C. chiasmata

D. terminalization

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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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A giant chromosome having many chromo-nemata lying side by side all along their length is called

A. megachromosome

B. heterosome

C. polytene chromosome

D. super numerary chromosome

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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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Albinism in com plants is best described as

A. lethal

B. sex-linked

C. inbred

D. dominance

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A functional unit of a gene which specifies synthesis of one poly-peptide is known as

A. clone

B. recon

C. cistron

D. codon

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If an individual does not breed true for its characters, it is called

A. homozygote

B. allelomorph

C. hybrid

D. ecotype

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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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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

A. Watson

B. Crick

C. Temin

D. Porter

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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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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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Transfer of a gene or genes through a virus is called

A. transformation

B. transduction

C. genetic engineering

D. sex-duction

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

A. recon

B. muton

C. criston

D. replicon

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Chromosomes exhibit minimum coiling during

A. prophase

B. metaphase

C. interphase

D. telophase

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In a monohybrid cross the Fi ratio of a backcross is

A. 1:1

B. 3:1

C. 1:2:1

D. 9:3:3:3

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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

A. all tall

B. 50% tall and 50% dwarf

C. all dwarf

D. data insufficient

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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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Down's syndrome is an example of

A. monosomy

B. trisomy

C. triploidy

D. polyploidy

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The best method to determine whether an individual is homozygous or heterozygous is

A. inbreeding

B. cross-breeding

C. back-crossing

D. self-fertilization

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The scientists who rediscovered the Mendel's laws are

A. Mast and Pantin

B. Watson and Crick

C. Corren, Tschermark and Hugo de Vries

D. Khorana and Nirenberg

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The nuclear membrane completely disappears during

A. late prophase

B. early metaphase

C. metaphase

D. interphase

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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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The possibilities of hereditary and evolutionary changes are greatest in species that reproduce by

A. fission

B. budding

C. asexual means

D. sexual means

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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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 A chemical mutagen is

A. X-rays

B. UV-rays

C. β-rays

D. 5-Bromo-Uracil

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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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 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. AB, RH+

B. AB, RH-

C. O, RH-

D. O, RH+