Genes and Chromosomes Test 5

Total Questions:50 Total Time: 60 Min

Remaining:

 

Questions 1 of 50

Question:Number of chromatids at metaphase is:

Answers Choices:

One in mitosis and two in meiosis

Two in mitosis and four in meiosis

Two in mitosis and one in meiosis

Two both in mitosis and meiosis

Questions 2 of 50

Question:The function of telomere is to:

Answers Choices:

stop transcription

initiate transcription

separate chromosome during cell division

maintain the individuality of chromosomes

Questions 3 of 50

Question:The scientific term which is not related to the primary constriction of a chromosome is:

Answers Choices:

centromere

kinomere

kinetochore

chromomere

Questions 4 of 50

Question:Allosomes are:

Answers Choices:

Bead-like structures on the chromosome

Node-like structures on the chromosome

Sex chromosomes

Rounded bodies

Questions 5 of 50

Question:In chromosome, the material controlling heredity is:

Answers Choices:

Histone

Chromosomin

RNA

DNA

Questions 6 of 50

Question:The nucleosome:

Answers Choices:

surrounds nuclear pores

has only DNA and non-histone proteins

is fully responsible for packing DNA into chromosomes

contains a core of histones with DNA wrapped around it

Questions 7 of 50

Question:Which one of the following is the largest chromosome?

Answers Choices:

Supernumerary chromosome

Polytene chromosome

X chromosome

Lampbrush chromosome

Questions 8 of 50

Question:Smallest segment of genetic material affected by mutation is:

Answers Choices:

Recon

Cistron

Muton

Exon

Questions 9 of 50

Question:Bateson used the terms coupling and repulsion for linkage and crossing over. Name the correct parental or coupling type along with its cross over or repulsion:

Answers Choices:

Coupling aaBB, aabb; Repulsion AABB, aabb

Coupling AABB. aabb, Repulsion AABB, AAbb

Coupling AAbb, aaBB; Repulsion AaBb, aabb

Coupling AABB, aabb; Repulsion AAbb, aaBB

Questions 10 of 50

Question:Number of linkage groups correspond to:

Answers Choices:

general structure of organism

diploid number of chromosomes

haploid number of chromosomes/pairs of chromosomes in a diploid

tetraploid number

Questions 11 of 50

Question:The phenomenon permitting exchange of chromosome segments is called:

Answers Choices:

Linkage

Segregation

Mutation

Crossing over

Questions 12 of 50

Question:Crossing over takes place between:

Answers Choices:

DNA and RNA

Nonhomologous chromosomes

Sister chromatids

Non-sister chromatids of homologous chromosomes

Questions 13 of 50

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

Answers Choices:

Deletion

Duplication

Inversion

Translocation

Questions 14 of 50

Question:Karyotype refers to:

Answers Choices:

genetic map of chromosome

chemical composition of chromosomes

phenotypic appearance of chromosome set

phenotypic appearance of one chromo­some

Questions 15 of 50

Question:In pea, seed coat colour changes from gray to white. This is an example of:

Answers Choices:

Induced mutation

Spontaneous mutation

Pleiotropic mutation

Transformation

Questions 16 of 50

Question:How many trisomies are possible in Datura?

Answers Choices:

10

12

24

30

Questions 17 of 50

Question:The haploid chromosome number of a sexually reproducing angiosperm is 12. The chromosome numbers of the embryo and endosperm plant are respectively:

Answers Choices:

12 and 36

24 and 36

36 and 24

24 and 24

Questions 18 of 50

Question:The basic set of chromosomes of a species is represented by:

Answers Choices:

X

2X

n

2n

Questions 19 of 50

Question:In Triticum aestivum, which type of polyploidy is present?

Answers Choices:

Hexapolyploidy

Allotetrapolyploidy

Hexaalloploidy

Allopolyploidy

Questions 20 of 50

Question:Point mutation is a change which involves:

Answers Choices:

loss of a gene

addition of a gene

change in a base of a gene

deletion of a segment of gene

Questions 21 of 50

Question:On which of the following crops, mutational studies have more intensively been done?

Answers Choices:

Millets

Legumes

Cabbage

Wheat

Questions 22 of 50

Question:Mutations induced by mutagenic agents are:

Answers Choices:

spontaneous mutations

point mutations

chemical mutations

none of these

Questions 23 of 50

Question:Transversion is:

Answers Choices:

insertion of nitrogenous base

replacement of a purine with a purine

replacement of pyrimidine with pyrimidine

replacement of a purine with a pyrimidine

Questions 24 of 50

Question:Base substitution caused by base analogues is:

Answers Choices:

Complementation

Transition

Transversion

None of these

Questions 25 of 50

Question:When a certain character is inherited only through female parent, it probably represents.

Answers Choices:

Cytoplasmic inheritance

Incomplete dominance

Multiple plastid inheritance

Mendelian nuclear inheritance

Questions 26 of 50

Question:Which is an example of cytoplasmic inheritance?

Answers Choices:

Height in pea

Eye colour in Drosophila

Flower colour in pea

Sterile pollen

Questions 27 of 50

Question:The sum total of extrachromosomal hereditary determinants in a cell form:

Answers Choices:

Plasmid

Plastid

Phasmid

Plasmon

Questions 28 of 50

Question:Mutational studies on Neurospora were carried out by:

Answers Choices:

Lederberg and Tatum

Beadle and Tatum

Beadle and Dodge

Lederberg and Dodge

Questions 29 of 50

Question:In Neurospora, 8 ascospores are formed; they are 2A, 2a, 2A, 2a. It shows:

Answers Choices:

no crossing over

some meiosis occurs

first generation division

second generation division

Questions 30 of 50

Question:If during synapsis a certain kind of abnormal chromosome is always forced to bulge away from its normal homologue, the abnormality is classified as:

Answers Choices:

an inversion

a duplication

a deficiency

an isochromosome

Questions 31 of 50

Question:Chromosome theory of inheritance was proposed by:

Answers Choices:

T.H. Morgan

Bateson and Punnett

Gregor Mendel

Sutton and Boveri

Questions 32 of 50

Question:If % of recombination between two genes is 50, the linkage will be:

Answers Choices:

Incomplete

Complete

Cis

Trans

Questions 33 of 50

Question:DNA elements which can change their positions are called:

Answers Choices:

Introns

Exons

Transposons

Cistrons

Questions 34 of 50

Question:Radioactive thymidine when added to the medium surrounding living mammalian cell gets incorporated into a newly synthesised DNA. Which of the following type of chromatin is expected to be radioactive if cells are exposed to radioactive thymidine as soon as they enter the S-phase?

Answers Choices:

Heterochromatin

Euchromatin

Both heterochromatin and euchromatin

Neither heterochromatin nor euchromatin

Questions 35 of 50

Question:Which of the following is not a term associate with genetic recombination in bacteria?

Answers Choices:

conjugation

translation

transduction

transformation

Questions 36 of 50

Question:A chromosome in which the centromere situated near one end is known as:

Answers Choices:

metacentric

submetacentric

acrocentric

telocentric

Questions 37 of 50

Question:Chromosomal aberrations refer to:

Answers Choices:

morphological changes

aneuploidy

polyploidy

all of these

Questions 38 of 50

Question:Linkage reduces the frequency of:

Answers Choices:

all parental types

homozygous recessive parents

hybrids

heterozygous dominant parents

Questions 39 of 50

Question:Ultraviolet radiation is injurious to plants because it:

Answers Choices:

breaks phosphate bonds

increases respiration

causes dehydration

causes genetic changes

Questions 40 of 50

Question:Mutation is the change in:

Answers Choices:

genetic drift

gene frequency

base pairs in DNA molecule

environmental mechanism of evolution

Questions 41 of 50

Question:The genes are in the form of:

Answers Choices:

proportion of base pairs

sequence of nucleotides

amount of base pairs

none of these

Questions 42 of 50

Question:Polytene chromosomes are found in:

Answers Choices:

Cells of salivary glands of mice

Cells of salivary glands of rabbits

Cells of salivary glands of some insects

Cells of salivary glands of human beings

Questions 43 of 50

Question:L-shaped chromosomes are called:

Answers Choices:

Sex-chromosomes

Acrocentrics

Submetacentrics

Telocentrics

Questions 44 of 50

Question:A base pair change:

Answers Choices:

results in new species

does not necessarily change the phenotype

always causes amino acid replacement

always alters protein function

Questions 45 of 50

Question:Which of the following is not a synonym of the jumping gene?

Answers Choices:

Transposon

Intervening sequence

Insertion sequence element

Transposable genetic element

Questions 46 of 50

Question:One of the functions of the telomere in a chromosome is to:

Answers Choices:

start RNA synthesis

'seal' the ends of chromosomes

help two chromatids to move towards the poles

identify the correct member of the homol­ogous pair of chromosome

Questions 47 of 50

Question:The chromosomes were first observed in the plant:

Answers Choices:

Allium

Colchicum

Vallisnaria

Tradescantia

Questions 48 of 50

Question:Mutation at the chromosomal level with an addition on individual chromosome is referred to as.

Answers Choices:

polysomy

polyploidy

point mutation

structural mutation

Questions 49 of 50

Question:When chromosome is lacking in a diploid set, it is called

Answers Choices:

trisomic

mullisomic

monosomic

pentasomic

Questions 50 of 50

Question:Variation of a character is brought about by

Answers Choices:

mutations

crossing over during meiosis

duplication of chromosomes during mitosis

both 1 and 2