Genes and Chromosomes Test 3

Total Questions:50 Total Time: 60 Min

Remaining:

 

Questions 1 of 50

Question:The term 'chromosome' was coined by:

Answers Choices:

Waldeyer

Benda

T. H. Morgan

Robert Hooke

Questions 2 of 50

Question:What is the correct sequence of the following events? 1. Formulation of the chromosome theory of heredity. 2. Experiments which proved that DNA is the hereditary material. 3. Mendel's law of inheritance.

Answers Choices:

1,3 and 2

1, 2 and 3

3, 1 and 2

2, 1 and 3

Questions 3 of 50

Question:Chromosome theory of inheritance was proposed by:

Answers Choices:

Mendel and Morgan

Lamarck and Darwin

Morgan and Brjdges

Sutton and Boveri

Questions 4 of 50

Question:The terminal end of chromosome is:

Answers Choices:

Telomere

Metamere

Satellite

Centromere

Questions 5 of 50

Question:Chromosomes with equal arms are called:

Answers Choices:

Submetacentric

Metacentric

Acrocentric

Telocentric

Questions 6 of 50

Question:Which of the following is not related to chromosome?

Answers Choices:

Aneuploidy

Euploidy

Klinefelter's syndrome

AIDS

Questions 7 of 50

Question:Prokaryotic chromosome consists of:

Answers Choices:

histones and nucleic acid

nonhistones and nucleic acid

only histones

none of these

Questions 8 of 50

Question:Eukaryotic chromosome is made of:

Answers Choices:

DNA

DNA + Lipids

DNA + Proteins

RNA

Questions 9 of 50

Question:Chromosomes found in prolonged prophase state in salivary glands of Drosophila are:

Answers Choices:

Lampbrush chromosomes

B-chromosomes

Heterochromosomes

Polytene chromosomes

Questions 10 of 50

Question:Balbiani rings are the structural features of:

Answers Choices:

polytene chromosomes

allosomes

lampbrush chromosomes

autosomes

Questions 11 of 50

Question:Chromosome pairing in salivary gland chromosomes resembles zygotene pairing in:

Answers Choices:

pairing occurs in homologous regions only

pairing occurs in nonhomologous regions only

it is followed by crossing over

it is followed by reductional separation

Questions 12 of 50

Question:Certain genetic elements that regularly "jump" to new locations, often inactivating the gene into which they become inserted, are called:

Answers Choices:

Heterochromaun

Episomes

Overlapping genes

Transposons

Questions 13 of 50

Question:A and B genes are linked. What shall be genotype of progeny in a cross between AB/ab and ab/ab?

Answers Choices:

AAbb and aabb

AaBb and aabb

AABB and aabb

None of these

Questions 14 of 50

Question:Linkage was first observed by:

Answers Choices:

Morgan

Darwin

Mendel

Bateson and Punnett

Questions 15 of 50

Question:In a cross between genotype AB and ++, 650 out of 1000 individuals were of parental type. The distance between A and B is:

Answers Choices:

35 map units

30 map units

15 map units

45 map units

Questions 16 of 50

Question:Mendel was not able to say anything about recombination and crossing over because:

Answers Choices:

he chose only pure type

traits he chose had no genes

he did not have a microscope with good resolving power

traits he chose were not linked and present on different chromosomes or were far apart

Questions 17 of 50

Question:The map distance between genes A and B is 3 units, between B and C 10 units, and between C and A 7 units. What is the order of the genes on the linkage map?

Answers Choices:

BAC

ABC

BCA

CBA

Questions 18 of 50

Question:The probability of a cross over occurring between two gene loci is proportional to:

Answers Choices:

activity of two loci

how far the loci are from the centromere

distance between the two loci

how tightly the chromosomes are packed in the nucleus

Questions 19 of 50

Question:The maximum frequency of a recombination of genes at two loci is :

Answers Choices:

25%

50%

75%

100%

Questions 20 of 50

Question:The term 'crossing over' was introduced by:

Answers Choices:

Morgan and Cattell

Sutton and Boveri

Bateson and Punnett

Beadle and Tatum

Questions 21 of 50

Question:Mutation theory was proposed by:

Answers Choices:

Hugo de Vries

Lamarck

Mendel

Darwin

Questions 22 of 50

Question:The mutation in germ cells can be detected in:

Answers Choices:

Same generation

Next generation

Both generations

None of the generations

Questions 23 of 50

Question:Which of the following mutations are not hereditary?

Answers Choices:

Genetic

Somatic

Germinal

Gametic

Questions 24 of 50

Question:Wheat plant is 6n = 42. What will be the number of chromosomes in its monosomic, haploid and monoploid?

Answers Choices:

43,21,7

41,21,7

13,7.7

15.7,7

Questions 25 of 50

Question:Seedless water melon plants are obtained by:

Answers Choices:

colchicine application

raising triploids

applying organic manure to the soil

inducing parthenogenesis

Questions 26 of 50

Question:Which of the following is a triploid tissue?

Answers Choices:

Endosperm

Nucleus

Synergid

Antipodal cell

Questions 27 of 50

Question:Colchicine brings about:

Answers Choices:

Cell division

Polyploidy

Cell elongation

Cell differentiation

Questions 28 of 50

Question:The scientist who used X-rays as mutagen for the first time was:

Answers Choices:

Leeuwenhoek

Lister

Hooker

Muller

Questions 29 of 50

Question:The best way to increase the yield of wheat in India is:

Answers Choices:

to remove weeds from wheat fields

to sow seeds of improved varieties

to reduce the quantity of ration in fair shops

to use tractors to till the soil

Questions 30 of 50

Question:The sites in the gene at which the mutations occur with unusually high frequency are:

Answers Choices:

Palindromes

Recons

Mutons

Hot spots

Questions 31 of 50

Question:Mutations are caused by:

Answers Choices:

Visible light

X-rays

Ultraviolet

Infrared

Questions 32 of 50

Question:The greatest source of variation is brought about by

Answers Choices:

Mutation

Meiosis

chromosomal aberrations

Polyploidy

Questions 33 of 50

Question:Mutations are mainly responsible for controlling

Answers Choices:

increasing population rate

maintaining genetic continuity

variation in organisms

extinction of organisms

Questions 34 of 50

Question:The term 'Plasmon' was introduced by:

Answers Choices:

Wettstein

Lederberg

Strasburger

Jenkins

Questions 35 of 50

Question:Which of the following fungus has been extensively used as an experimental material in the study of genetics?

Answers Choices:

Neurospora

Drosophila

Pisum

All of these

Questions 36 of 50

Question:Upon which two major features of chromosomes does their cytological identification depend?

Answers Choices:

chromosome thickness and length

position of centromere and chromosome length

amount of DNA and intensity of staining

number of chromatids and length of arms

Questions 37 of 50

Question:A treatment often used to induce polyploidy experimentally in plants is:

Answers Choices:

X-rays

Colchicine

Gibberellic acid

Acridine dyes

Questions 38 of 50

Question:Drosophila melanogaster possesses eight chromosomes in somatic cell. How many linkage groups will be there?

Answers Choices:

8

4

2

1

Questions 39 of 50

Question:Lampbrush chromosomes are found in:

Answers Choices:

all somatic cells

all germ cells

oocytes of urodel amphibians

salivary gland cells of fruit fly

Questions 40 of 50

Question:Balbiani rings are centres for:

Answers Choices:

DNA synthesis

RNA synthesis

Both DNA and RNA synthesis

None

Questions 41 of 50

Question:Crossing over occurs between:

Answers Choices:

two sister chromatids of same chromosome

two non-sister chromatids of same bivalent

two non-sister chromatids of different bivalents

none

Questions 42 of 50

Question:Majority of the mutations are:

Answers Choices:

harmful

dominant

beneficial

harmful and recessive

Questions 43 of 50

Question:Chromosome complement with 2n - 1 is called as:

Answers Choices:

nullisomy

monosomy

trisomy

tetrasomy

Questions 44 of 50

Question:Euploidy is best explained as:

Answers Choices:

one chromosome more than the diploid set

one chromosome more than the haploid set

exact multiples of a haploid set of chromo­some

one chromosome less than the haploid set

Questions 45 of 50

Question:If there are 16 chromosomes in the roots of onion, then the number of chromosomes in spore mother cells will be:

Answers Choices:

2

4

8

16

Questions 46 of 50

Question:Desired improved variety of economically useful crops are raised by:

Answers Choices:

natural selection

hybridization

biofertilizer

mutation

Questions 47 of 50

Question:Diploid number of chromosomes in Gorilla gorilla is:

Answers Choices:

46

48

50

64

Questions 48 of 50

Question:The haploid chromosome number in Saccharum is as many times greater in the following as that of Zea mays:

Answers Choices:

4 fold

2 fold

6 fold

3 fold

Questions 49 of 50

Question:The chromosome associated with sex determination is known as

Answers Choices:

autosomes

allosomes

accessory chromosomes

determinant chromosomes

Questions 50 of 50

Question:Name the scientist who was awarded the Nobel Prize for his genetic studies on the linear arrangement of genes on chromosomes in the fruit fly, Drosophila melanogaster

Answers Choices:

C.F. Wolff

T.A. Knight

T.H. Morgan

J. Swammerdam