Genes and Chromosomes Test 1

Total Questions:50 Total Time: 60 Min

Remaining:

 

Questions 1 of 50

Question:If the root cell in wheat plant has 42 chromosomes, then the number of chromosomes in the synergid cell is:

Answers Choices:

14

28

42

21

Questions 2 of 50

Question:The chromosomal proteins, histones are devoid of:

Answers Choices:

lysine

histidine

arginine

tryptophan

Questions 3 of 50

Question:Each chromosome pair has distinct morphology with regard to:

Answers Choices:

relative length of the arms and position of centromere

relative length of the chromosomes but the position of centromere does not matter

position of centromere but the length of chromosome is not important

the number of active genes present

Questions 4 of 50

Question:Chromosome with median centromere and equal arms is:

Answers Choices:

Metacentric

Submetacentric

Acrocentric

Telocentric

Questions 5 of 50

Question:Which of the following will cause a more effective mutation?

Answers Choices:

one codon

base substitution

one base deletion

base deamination

Questions 6 of 50

Question:The ovum of human female has autosomes:

Answers Choices:

22 pairs

23 pairs

44 pairs

11 pairs

Questions 7 of 50

Question:The chromosome cannot be stained with:

Answers Choices:

Eosin

Haematoxylin

Acetocarmine

Feulgen stain

Questions 8 of 50

Question:Genetic elements which possess dual capacity to exist either as a chromosomal or extrachro-mosomal entity are known as:

Answers Choices:

Mesosomes

Oxysomes

Episomes

Autosomes

Questions 9 of 50

Question:The term 'nucleosome' was given by:

Answers Choices:

DuPraw

Oudet

Flemming

Emil Heitz

Questions 10 of 50

Question:In which typical stage are lampbrush chromosomes seen?

Answers Choices:

Mitosis

Prophase

Mitotic prophase

Meiotic prophase

Questions 11 of 50

Question:Lampbrush chromosomes were discovered by:

Answers Choices:

Ruckert

Balbiani

Morgan

McClung

Questions 12 of 50

Question:A gene is made up of:

Answers Choices:

DNA

RNA

Either DNA or RNA

Amino acids

Questions 13 of 50

Question:Association of parental combination of characters in offspring in excess of dihybrid cross is due to:

Answers Choices:

Pseudoalleles

Polygeny

Linkage

Codominance

Questions 14 of 50

Question:Which of the following is suitable for experiment on linkage?

Answers Choices:

AaBb x AaBb

AABB x aabb

aaBB x aaBB

AAbb x AaBB

Questions 15 of 50

Question:Two genes situated very close on the chromosome show:

Answers Choices:

High crossing over

No crossing over

Hardly any crossing over is detected

Only double crossing over can occur

Questions 16 of 50

Question:Linked genes may be separated by:

Answers Choices:

Crossing over

Polyploidy

Gene mutation

Segregation

Questions 17 of 50

Question:Crossing over takes place in:

Answers Choices:

Four-strand stage

Three-strand stage

Two-strand stage

One-strand stage

Questions 18 of 50

Question:The function of crossing over is:

Answers Choices:

segregation of genes

distribution of linked genes

segregation of chromosomes

recombination of alleles

Questions 19 of 50

Question:Sudden inheritable genetic change is:

Answers Choices:

Natural selection

Independent assortment

Inheritance of acquired trait

Mutation

Questions 20 of 50

Question:The plant on which de Vries worked in preparation of mutation theory was:

Answers Choices:

Sweet pea

Garden pea

Evening primrose

Pansy

Questions 21 of 50

Question:de Vries attributed evolution to:

Answers Choices:

Polygenes

Slow differentiation

Discontinuous variation

Continuous variation

Questions 22 of 50

Question:If a mutation is not visible in successive generations, it is called:

Answers Choices:

segregation

deletion

recessive mutation

dominant mutation

Questions 23 of 50

Question:An organism or cell having a chromosome number that is higher than the exact multiple of the basic number is known as:

Answers Choices:

Hyperploid

Hypoploid

Autopolyploid

Allopolyploid

Questions 24 of 50

Question:Trisomy has chromosome complement of:

Answers Choices:

2n - 1

2n - 1 - 1

2n + 1

2n + 1 + 1

Questions 25 of 50

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

Answers Choices:

recessive mutations is expressed in F1

recessive mutation is expressed in F2

dominant phenotype is suppressed

dominant phenotype becomes expressed

Questions 26 of 50

Question:In crop improvement programme, haploids are of great importance because they:

Answers Choices:

grow better under adverse conditions

are useful in studies on meiosis

require only about half the amount of chem­ical fertilizers as compared to diploids

give homozygous lines following diploidization

Questions 27 of 50

Question:Man-made cereal in which allopolyploidy is seen in:

Answers Choices:

Wheat

Triticale

Rice

Rye

Questions 28 of 50

Question:Triticale is obtained by crossing wheat with:

Answers Choices:

oat

maize

rye

barley

Questions 29 of 50

Question:The creation of mutations is called:

Answers Choices:

Evolution

Radiation

Mutagenesis

Saltatory changes

Questions 30 of 50

Question:The substance which causes a definite change in genes is called:

Answers Choices:

Cytotoxin

Alkaloid

Toxin

Mutagen

Questions 31 of 50

Question:Out of A-T, G-C pairing, bases of DNA may exist in alternate valency state owing to arrangement called:

Answers Choices:

point mutation

frame-shift mutation

analogue substitution

tautomerisational mutation

Questions 32 of 50

Question:If the DNA codons are ATG ATG ATG and a cytosine base is inserted at the beginning, which of the following will result?

Answers Choices:

CA TGA TGA TG

C ATG ATG ATG

CAT GAT GAT G

A non-sense mutation

Questions 33 of 50

Question:Genes not located within the nucleus are almost always found in

Answers Choices:

Cytoskeleton

Ribosome

Cell membrane

Cytosol

Questions 34 of 50

Question:Variegated colouration of leaves, first studied by Correns in 1909, is inherited only from the female plant. The genes coding for this trait are located in the.

Answers Choices:

Plastid

Nucleus

Ribosomes

Endoplasmic reticulum

Questions 35 of 50

Question:Neurospora is a:

Answers Choices:

parasite

facultative parasite

facultative saprophyte

always saprophyte

Questions 36 of 50

Question:In Neurospora, eight ascospores are formed instead of four. This indicates:

Answers Choices:

one meiosis

two meiosis

two mitosis

meiosis followed by mitosis

Questions 37 of 50

Question:If a chiasma forms between the loci of genes A and B in 20% of the tetrads of an individual of genotype AB/ab, the percentage of gametes expected to be Ab is:

Answers Choices:

5

10

20

40

Questions 38 of 50

Question:Frameshift mutation occurs when:

Answers Choices:

base is added

base is deleted

anticodons are not present

base is added or deleted

Questions 39 of 50

Question:Genes are packed into a bacterial chromosome by:

Answers Choices:

Acidic protein

Basic protein

Histones

Actin

Questions 40 of 50

Question:A substitution mutation at one nitrogenous base of the first codon of a gene produces a nonfunctional protein. Such a mutation is called:

Answers Choices:

Non-sense mutation

Mis-sense mutation

Frameshift mutation

Reverse mutation

Questions 41 of 50

Question:What base is responsible for hot spots for spontaneous point mutations?

Answers Choices:

Adenine

Guanine

5-bromouracil

5-methyl cytosine

Questions 42 of 50

Question:The formation of multivalents at meiosis in a diploid organism is due to:

Answers Choices:

Deletion

Inversion

Monosomy

Reciprocal translocation

Questions 43 of 50

Question:Distance between two linked genes upon a chromosome, measured in cross-over units, is:

Answers Choices:

ratio of crossing over between them

number of other genes between them

cross-over value

none of these

Questions 44 of 50

Question:DNA is associated with highly basic proteins called:

Answers Choices:

histories

non-histones

albumins

both (1) and (2)

Questions 45 of 50

Question:Gene flow is described as:

Answers Choices:

The transfer of genes from the sperms to eggs

The transfer of genes from the nucleus to chromosomes

The exchange of genes between male and female organism

The transfer of genes between populations which differ genetically from one another but can interbreed

Questions 46 of 50

Question:The exchange of one part of a chromosome to the other part of another chromosome is called:

Answers Choices:

Translocation

Mutation

Linkage

Inversion

Questions 47 of 50

Question:Transition type of mutation is caused when:

Answers Choices:

GC is replaced by TA

AT is replaced by CG

CG is replaced by GC

AT is replaced by GC

Questions 48 of 50

Question:The first gene to be synthesized by Khorana and other in 1970 was:

Answers Choices:

an oncogene

\(\beta - globin\,gene\)

alanyl tRNA gene

lactose operon gene

Questions 49 of 50

Question:If a diploid cell is treated with colchicine, then it becomes

Answers Choices:

diploid

tetraploid

triploid

monoploid

Questions 50 of 50

Question:Reason for fast speciation in present day crop plant is

Answers Choices:

isolation

polyploidy

mutation

sexual reproduction