Genes and Chromosomes Test 2

Total Questions:50 Total Time: 60 Min

Remaining:

 

Questions 1 of 50

Question:Diploid chromosome number in humans is:

Answers Choices:

42

44

48

46

Questions 2 of 50

Question:Genome represents:

Answers Choices:

Haploid chromosome set

Diploid chromosome set

Complete chromosome set

All the genes present in the population

Questions 3 of 50

Question:Crossing over occurs in:

Answers Choices:

mitotic cells

amitotic cells

meiotic cells

mutating cells

Questions 4 of 50

Question:An autosome is:

Answers Choices:

Sex chromosome

Chromosome half

Chromosome other than sex

None of the above

Questions 5 of 50

Question:A nucleosome is made of:

Answers Choices:

DNA

Histone

Histone wrapped over octameric core of nucleic acid

DNA wrapped over octameric core of his­tone

Questions 6 of 50

Question:An octamer of four histones complex with DNA forms:

Answers Choices:

Centrosome

Endosome

Nucleosome

Centromere

Questions 7 of 50

Question:The terms cistron, recon and muton were coined by:

Answers Choices:

Lederberg

Benzer

Bateson

Ingram

Questions 8 of 50

Question:The gene concerned with the production of cancer is called:

Answers Choices:

Oncogene

Carcinogen

Cancer gene

Carcinoma

Questions 9 of 50

Question:Mendel found that some traits do not assort independently. Later workers found it due to:

Answers Choices:

Linkage

Amitosis

Dominance of one trait over another

Crossing over

Questions 10 of 50

Question:When two or more characters do assort independently in F2 generation it indicates that characters are not:

Answers Choices:

lethal

linked

recessive

dominant

Questions 11 of 50

Question:Alleles of different genes found on same chromosome may be separated due to:

Answers Choices:

Pleiotropy

Epistasis

Crossing over

Continuous variation

Questions 12 of 50

Question:Cis-trans expression of genes is an example of:

Answers Choices:

Cytoplasmic inheritance

Mutation

Intergenic crossing over

Intragenic crossing over

Questions 13 of 50

Question:In which phase of meiosis. crossing over takes place?

Answers Choices:

Prophase of meiosis I

Prophase of meiosis II

Anaphase of meiosis I

Anaphase of meiosis II

Questions 14 of 50

Question:The plant which made Hugo de Vries famous is:

Answers Choices:

Antirrhinum majus

Oenothera lamarckiana

Pisum sativum

Lathyrus odoratus

Questions 15 of 50

Question:The functional unit of gene is:

Answers Choices:

codon

recon

cistron

muton

Questions 16 of 50

Question:A trisomic individual possesses extra chromosomes:

Answers Choices:

Four

Three

Two

One

Questions 17 of 50

Question:Datura is a classical example of:

Answers Choices:

Trisomy

Triploidy

Monosomy

Monoploidy

Questions 18 of 50

Question:Haploids are used for researches in genetics because they contain:

Answers Choices:

one-half of the genome

only one set of genomes

two sets of genomes

one-quarter set of genome

Questions 19 of 50

Question:The term 'polyploid' was introduced by:

Answers Choices:

Correns

Strasburger

Blakeslee

Morgan

Questions 20 of 50

Question:Polyploidy means:

Answers Choices:

occurrence of haploid set of chromosomes

occurrence of diploid set of chromosomes

occurrence of three or more sets of chro­mosomes

all of these

Questions 21 of 50

Question:Man-made cereal is:

Answers Choices:

Triticum

Triticale

Eleusine

Hordeurn

Questions 22 of 50

Question:Raphanobrassica is a/an:

Answers Choices:

autopolyploid

allotetraploid

hexaploid

none

Questions 23 of 50

Question:Gene mutation is due to:

Answers Choices:

random segregation

linkage and crossing over

change in sequence of cistrons in DNA

change in base sequence

Questions 24 of 50

Question:Which of the following is a base analogue?

Answers Choices:

Colchicine

Nitrous acid

5-Bromouracil

Caffeine

Questions 25 of 50

Question:Mutations are induced mostly by:

Answers Choices:

Beta rays

UV radiations

Alpha rays

Gamma rays

Questions 26 of 50

Question:Mutations used in agriculture are commonly:

Answers Choices:

spontaneous

induced

recessive and lethal

recessive

Questions 27 of 50

Question:A segment of the DNA has a base sequence AAG, GAG, GAC, CAA, CCA, which of the following sequences represents a frame-shift mutation?

Answers Choices:

AAG GAG GAC CAA CCA

AGG AGG ACC AAC CA

ACG GAC GAC CAG CCA

AAG GCG GAC CCA AC

Questions 28 of 50

Question:Which of the following mutagens increases distance between the neighbouring N2 base pairs (from 3.4A to 6.8A) and causes frame-shift mutation?

Answers Choices:

Proflavine

2-Aminopurine

5-Bromouracil

Methane sulfonates

Questions 29 of 50

Question:Type of gene mutation which involves replacement of purine with pyrimidine or vice-versa or the substitution of one type of base with another type of base is:

Answers Choices:

Transduction

Translation

Transversion

Transition

Questions 30 of 50

Question:Which of the following carries extranuclear genetic material ?

Answers Choices:

Chromosomes

Golgi apparatus

Ribosomes

Plastids

Questions 31 of 50

Question:The organelles responsible for cytoplasmic inheritance among eukaryotes are.

Answers Choices:

Chloroplasts and Mitochondria

Mitochondria and Golgi complex

Chloroplasts and Lysosomes

Lysosomes and Mitochondria

Questions 32 of 50

Question:Cytoplasmic male sterlity is passed down.

Answers Choices:

biparentally

maternally

paternally

through bacteriophage

Questions 33 of 50

Question:Which arrangement of ascospores in Neurospora does not represent second-division segregation?

Answers Choices:

AAaaAAaa

aaaaAAAA

AAaaaaAA

aaAAAAaa

Questions 34 of 50

Question:One gene one enzyme hypothesis was given by:

Answers Choices:

Griffith

Jacob and Monod

Beadle and Tatum

Johnson

Questions 35 of 50

Question:'One gene one enzyme' concept means:

Answers Choices:

one gene controls one enzyme

all enzymes are controlled by genes

enzyme controls gene

all genes are controlled by enzymes

Questions 36 of 50

Question:Which of the following is not characteristic of heterochromatin?

Answers Choices:

usually found in centromeric regions

identifiable in at least some interphase chromosomes

associated with active genes

located in the dark bands of polytene chro­mosomes.


Questions 37 of 50

Question:That genes are arranged linearly in a chromosome was concluded by the study of:

Answers Choices:

codominance

incomplete dominance

linkage and crossing over

sex chromosome

Questions 38 of 50

Question:The total number of genes present in a haploid cell is:

Answers Choices:

Genome

Genotype

Karyotype

Gene pool

Questions 39 of 50

Question:After crossing of two plants, the progenies are found to be male sterile. This phenomenon is found to be maternally inherited and is due to some genes which reside in:

Answers Choices:

nucleus

chloroplast

mitochondria

cytoplasm

Questions 40 of 50

Question:Genetic identity of a human male is determined by:

Answers Choices:

sex chromosomes

autosomes

nucleoli

cell organelles

Questions 41 of 50

Question:Gene frequency of a population will continue to remain stable unless it is not influenced by:

Answers Choices:

Random mating

Selection

Random drift

Mutation

Questions 42 of 50

Question:Crossing over in diploid organism is responsible for:

Answers Choices:

segregation of alleles

dominance of genes

recombination of linked alleles

linkage between genes

Questions 43 of 50

Question:Gene and cistron terms are sometimes used synonymously because:

Answers Choices:

one gene contains no cistron

one gene contains one cistron

one gene contains many genes

one gene contains many cistrons

Questions 44 of 50

Question:A single gene mutation affecting more than one phenotype is called:

Answers Choices:

pleiotrophic

auxotrophic

azotrophic

pleiotropic

Questions 45 of 50

Question:A point mutation comprising the substitution of a purine by pyrimidine is called:

Answers Choices:

Transition

Deletion

Translocation

Transversion

Questions 46 of 50

Question:Chromatin consists of:

Answers Choices:

RNA

DNA

RNA and histories

DNA and histones

Questions 47 of 50

Question:Nucleosome consists of:

Answers Choices:

Genes

Histones

Microfilaments

Nucleolus

Questions 48 of 50

Question:A micromutation is:

Answers Choices:

polyploidy

change in gene

deletion of chromosome

addition of chromosome

Questions 49 of 50

Question:Change in sequence of nucleotide in DNA is called as

Answers Choices:

mutagen

translation

mutation

recombination

Questions 50 of 50

Question:Replacement of a purine base by another purine base is called

Answers Choices:

somatic mutation

addition mutation

delection mutation

substitution mutation