Genes and Chromosomes Test 4

Total Questions:50 Total Time: 60 Min

Remaining:

 

Questions 1 of 50

Question:The relationship between the behaviour of chromosomes and the behaviours of Mendel's factors was first recognized by W.S. Sutton and Boveri in

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1869

1890

1902

1938

Questions 2 of 50

Question:Number of chromatids present in a metaphase chromosome is:

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Four

Three

Two

One

Questions 3 of 50

Question:When the position of the centromere is at the terminal end of the chromosome, it is called:

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Metacentric

Submetacentric

Telocentric

Acrocentric

Questions 4 of 50

Question:Lowest chromosome number is found in:

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Poa litorosa

Salix tetrasperma

Haplopappus gracilis

Ageratum conyzoides

Questions 5 of 50

Question:Chromosome contains:

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DNA

RNA

ATP

Amylase

Questions 6 of 50

Question:Chemically chromosomes of higher organisms are composed of:

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Nucleic acid

Lipoproteins

Nucleoproteins

Histone

Questions 7 of 50

Question:Polytene or giant chromosomes are found in salivary glands of:

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Drosophila

Man

Woman

All animals

Questions 8 of 50

Question:Balbiani discovered a special type of chromosome from salivary gland of Chironomus larvae which are recognized by the presence of:

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Bands

Loops

Both bands and loops

All of the above

Questions 9 of 50

Question:Mendelian recombinations are due to:

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Linkage of genes

Mutation

Dominance

Independent assortment

Questions 10 of 50

Question:Linkage was first observed in:

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field pea

sweet pea

grass pea

garden pea

Questions 11 of 50

Question:Two dominant nonallelic genes are 50 map units apart. The linkage is:

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Complete

Absent

Trans type

Cis type

Questions 12 of 50

Question:Hybrids are more vigorous than parents because they are:

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homozygous

heterozygous

with viable genes

somatogemy in the fusion of gametes

Questions 13 of 50

Question:Hybrid vigour is due to:

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chiasma

linkage

heterozygosity

crossing over

Questions 14 of 50

Question:The evidence that crossing over occurs in 4-strand stage comes from the experiments on:

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Drosophila

Neurospora

Pisum

Maize

Questions 15 of 50

Question:Rearrangement of a group of genes in a chromosome in such a way that their order in the chromosome is reversed is referred to as:

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Inversion

Translocation

Deficiency

Interchange

Questions 16 of 50

Question:Harmful mutations do not get eliminated from gene pool because:

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they are recessive and carried by heterozy­gous individuals

they are formed repeatedly they have survival value

genetic drift

None of these

Questions 17 of 50

Question:Which one of the following correctly explains the term 'Chimaera'?

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during mutation at segregation, chromo­some become equally distributed

breaking a part of chromosome segment during mutation

spontaneously induced deletions

development of genetically diverse tissues in the same organism

Questions 18 of 50

Question:Haploids are able to express both recessive and dominant alleles/mutations because there are:

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many alleles for each gene

two alleles for each gene

only one allele in a gene

only one allele for each gene in the individual

Questions 19 of 50

Question:Haploids are preferred over diploids for mutation studies because in haploids:

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tissue culture is easy

mutations are readily induced

dominant mutations express immediately

recessive mutations express immediately

Questions 20 of 50

Question:Which one can induce polyploidy?

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Acridines

Maleic hydrazide

Ethylene

Colchicine

Questions 21 of 50

Question:Colchicine interferes with:

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chromosome replication

chromosome condensation

incorporation of nitrogenous bases

organisation of spindle

Questions 22 of 50

Question:Hexaploid wheat is:

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Triticum monococcum

Triticum turgidum

Triticum durum

Triticum aestivum

Questions 23 of 50

Question:Hereditary variations in plants have been produced by the use of:

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X-rays

Gibberellic acid

DDT

Auxins

Questions 24 of 50

Question:Which one of the following is not a mutagen?

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Acetic acid

Nitrous acid

5-bromouracil

Gamma radiation

Questions 25 of 50

Question:Who has introduced X-ray mutations in barley and maize?

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Muller

Stadler

Morgan

All of them

Questions 26 of 50

Question:Mutations can be brought about in plants by:

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Aniline dyes

Auxins

DDT

X-rays

Questions 27 of 50

Question:A mutation that changes a codon specifying one amino acid to a termination codon is called a:

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missense mutation

transition mutation

nonsense mutation

frameshift mutation

Questions 28 of 50

Question:The gene which increase the frequency of mutations in other genes is referred to as:

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mutagene

mutator gene

hypostatic gene

complementary gene

Questions 29 of 50

Question:Replacement of a purine nucleotide with a pyrimidine nucleotide is:

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Transition

Frame-shift

Transversion

Inversion mutation

Questions 30 of 50

Question:A child has a single kidney since birth. This variation is.

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positive meristic

negative meristic

blastogenic

substantive

Questions 31 of 50

Question:Discontinuous variation are

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acquired characters

mutations

essential features

non-essential features

Questions 32 of 50

Question:Mutations which do not cause any change in the protein are

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Mis-sense mutations

Non-sense mutations

Silent mutations

Frameshift mutations

Questions 33 of 50

Question:Drosophila of the plant kingdom is:

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Penicillium

Neurospora

Pisum sativum

Both (1) and (3)

Questions 34 of 50

Question:Neurospora is commonly called:

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Black mold

Pin mold

Pink bread mold

All of these

Questions 35 of 50

Question:At what stage does meiosis take place in Neurospora?

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during gamete formation

during conidial development

during trichogyne development

during ascospore development

Questions 36 of 50

Question:A mechanism that cause a gene to move from one linkage group to another is:

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Dosage compensation

Crossing over

Inversion

Translocation

Questions 37 of 50

Question:A segment of chromosome may be protected from recombination by:

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an inversion

a translocation

balanced lethal

all of the above

Questions 38 of 50

Question:If 4 chromosomes synapse into a cross-shaped configuration during meiotic prophase, the organism is heterozygous for a:

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translocation

pericentric inversion

deletion

paracentric inversion

Questions 39 of 50

Question:Chromosomes are arranged in the equitorial plate during:

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Prophase II

Metaphase II

Anaphase II

Telophase II

Questions 40 of 50

Question:A Neurospora is auxotroph for tyrosine, an amino acid. This means:

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it can survive without tyrosine

it cannot survive without tyrosine

there is no relationship with tyrosine

none

Questions 41 of 50

Question:Which pair is a chromosomal aberration?

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Duplication and translocation

Duplication and transduction

Duplication and transversion

All of these

Questions 42 of 50

Question:Which one of the following radiations is non-ionising and has more specific biological effects than others?

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p-rays

X-rays

Gamma rays

Ultraviolet rays

Questions 43 of 50

Question:An autotetraploid plant bearing a genotype AAAa is called as:

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Monosomic

Trisomic

Triploid

Triplex

Questions 44 of 50

Question:A double monosomic is correctly represented as: 

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2n-2

2n + 2

2n + 1 + 1

2n - 1 - 1

Questions 45 of 50

Question:The cytoplasmic inheritance is also called:

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Maternal inheritance

Cytoplasmic association

Clonal inheritance

None of these

Questions 46 of 50

Question:Maternal inheritance is due to the genes present in:

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Nucleus

Nucleoplasm

Lysosome

Mitochondria

Questions 47 of 50

Question:Extranuclear inheritance occurs in:

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peroxisomes and ribosomes

chloroplasts and lysosomes

mitochondria and ribosomes

chloroplasts and mitochondria

Questions 48 of 50

Question:Jumping genes occur in:

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bacteria only

eukaryotes only

bacteriophages only

both eukaryotes and prokaryotes

Questions 49 of 50

Question:There are three genes a,b and c. Percentage of crossing over between a and b is 20 and b and c is 28 and a and c is 8. What is sequence of genes on the chromosomes ?

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b,a,c

a,b,c

a,c,b

None of these

Questions 50 of 50

Question:The exchange of chromosome segments between nonhomologous chromosomes is called

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transfer

delection

translocation

frameshift