Biology - Genetics and Evolution
Exam Duration: 45 Mins Total Questions : 30
A common test to find the genotype of a hybrid is by
- (a)
crossing of one\(F_{2}\) progeny with male parent
- (b)
crossing of one \(F_{2}\)progeny with female parent
- (c)
studying the sexual behaviour of \(F_{1}\)progenies
- (d)
crossing of one\(F_{1}\) progeny with male parent
Extranuclear inheritance is a conserquences of presence of genes in
- (a)
mitochondria and chloroplasts
- (b)
endoplasmic reticulum and mitochondria
- (c)
ribosomes and chloroplasts
- (d)
iysosomes and ribosomes
Semiconservative model of DNA replication was first demonstrated by
- (a)
Watson and Crick
- (b)
Meselson and Stahl
- (c)
Herbert Taylor
- (d)
Har Govind Khorana
Which one of the following is not a part of a transcription unit in DNA?
- (a)
The inducer
- (b)
A terminator
- (c)
A promoter
- (d)
The structural gene
In the developmental history of mammalian heart,it is observed that it passes through a two-chambered fish-like heart,three chambered frog-like heart and finally four-chambered stage.To which hypothesis can this above cited statement by approximated
- (a)
Biogenetic law
- (b)
Hardy-Weinberg law
- (c)
Lamarck's principle
- (d)
Mendelian principles
Pick out the correct statements.
(I) Haemophilia is a sex-linked recessive disease.
(II) Down's syndrome is due to aneuploidy.
(III) Phenylketonuira is an autosomal recessive gene disorder
(IV) Sickle cell anaemia is an X-linked recessive gene disorder
- (a)
II and IV are correct
- (b)
I, III and IV are correct
- (c)
I, II and III are correct
- (d)
I and IV are correct
The replication of DNA strands involves the following except
- (a)
DNA polymerase
- (b)
The specific ori site
- (c)
Replication fork
- (d)
Promoter site
Which of the following is the example of Sex-linked disease?
- (a)
AIDS
- (b)
Colour blindness
- (c)
syphiliss
- (d)
Gonorrhoea
A and B genes are linked. What shall be the genotype of progeny in a cross between AB/ab and ab/ab?
- (a)
AABB and aabb
- (b)
AaBb and aabb
- (c)
AABB and aabb
- (d)
None of these
If Mendel had studied the seven traits using a plant with 12 chromosomes instead of 14, in what way would his interpretation have been different?
- (a)
He would have mapped the chromosome
- (b)
He would have discovered blending or incomplete dominance
- (c)
He would not have discovered the law of independent assortment
- (d)
He would have discovered sex-linkage
Half-life period of C14 is about
- (a)
500 yr
- (b)
5730 yr
- (c)
50 yr
- (d)
5 x 104 yr
Two linked genes a and b show 20% recombination. The individuals of a dihybrid cross between ++/++ x ab/ab shall show gametes
- (a)
++80 : ab : 20
- (b)
++50 : ab: 50
- (c)
++ 40 : ab 40: + a 10: + b: 10
- (d)
+ + 30 : ab 30 : + a 20 : + b : 20
A family of five daughters only is expecting sixth issue. The chance of its beings a son is
- (a)
Zero
- (b)
25%
- (c)
50%
- (d)
100%
Read the following statements.
(i) One codon codes for only one amino acid.
(ii) Some amino acids are coded by more than one codon.
(iii) The sequence of triplet nitrogenous bases in DNA or mRNA corresponds to the amino acid sequence in the polypeptide chain.
Give suitable terms for the characteristics of 'genetic code' as per the above statements.
- (a)
Degeneracy Colinearity Unambiguous (i) (iii) (iii) - (b)
Degeneracy Colinearity Unambiguous (iii) (ii) (i) - (c)
Degeneracy Colinearity Unambiguous (ii) (iii) (i) - (d)
Degeneracy Colinearity Unambiguous (i) (ii) (iii)
The diagram given here shows the skulls of two different mammals
Which of the following accurately describes the differences between these skulls?
- (a)
Skull A has more teeth than skull B.
- (b)
Skull A has more brain capacity than skull B
- (c)
Skull A is of a human and skull B is of an ape.
- (d)
Skull A is of an ape and skull B is of human.
Match column I with column II and select the correct option from the given codes.
Column I | Column II |
A. Gregor J. Mendel | (i)Chromosomal theory of inheritance |
B. Sutton and Boveri | (ii)Laws of inheritance |
C. Henking | (iii)Drosophila |
D. Morgan | (iv)Discovered X-body |
- (a)
A-(ii), B-(i), C-(iv), D-(iii)
- (b)
A-(iv), B-(i), C-(ii), D-(iii)
- (c)
A-(iv), B-(ii), C-(i), D-(iii)
- (d)
A-(ii), B-(iii), C-(iv), D-(i)
Assertion: Pairing and separation of pair of chromosomes would lead to segregation of a pair of factors they carried.
Reason: Two alleles of a gene pair are located on similar sites on non-homologous chromosomes.
- (a)
If both assertion and reason are true and reason is the correct explanation of assertion.
- (b)
If both assertion and reason are true but reason is not the correct explanation of assertion.
- (c)
If assertion is true but reason is false.
- (d)
If both assertion and reason are false
When a heterozygous tall pea plant of F1 generation upon self fertilization produces tall and dwarf phenotypes it proves the principle of
- (a)
Dominance
- (b)
Segregation
- (c)
Independant assortement
- (d)
Inheritance & purity of gameters
A useful process for determining whether an individual is homozygous or heterozygous is:
- (a)
Cross-breeding
- (b)
self fertilization
- (c)
Back-crossing
- (d)
Test cross
A phenomenon which works opposite to linkage is
- (a)
Independent assortment
- (b)
Crossing-over
- (c)
Segregation
- (d)
Mutation
Read the following four statement (A-D):
(A) In transcription, adenosine pairs with uracil.
(B) Regulation of lac operon by repressor is referred to as positive regulation.
(C) The human genome has approximately 50000 genes.
(D) Haemophilia is a sex-linked recessive disease.
How many of the above statements are right?
- (a)
Four
- (b)
One
- (c)
Two
- (d)
Three
An individual homozygous for genes cd is crossed with wild type ++ and F1 crossed back with the double ressive. The appearance of the offsprings is as follows
++⟶ 903
cd⟶897
+d⟶98
c+⟶102
The distance between the genes c and d is
- (a)
20 map units
- (b)
9.8 map units
- (c)
10.2 map units
- (d)
10 map units
Father of DNA finger printing is
- (a)
Alec Jeffreys
- (b)
Lalji Singh
- (c)
V.K. Kashyap
- (d)
E.M. Southern
The Neanderthal man had a cranial capacity of around
- (a)
1600 cc
- (b)
650-800cc
- (c)
900cc
- (d)
1400cc
Hallmark of the Watson and crick three dimensional DNA model was based upon the findings of
- (a)
Wilkins and Franklin
- (b)
Erwin Chargaff
- (c)
Hershey and chase
- (d)
Meselson and Stahl
Peripatus is a connecting link between
- (a)
Mollusca and Echinodermata
- (b)
Annedia and Arthropoda
- (c)
Coelenterata and Porifera
- (d)
Ctenophora and Platyhelminthes
Mark the odd one (w.r.t. dominant trait in garden pea)
- (a)
Yellow pod
- (b)
Inflated pod
- (c)
Axial flower
- (d)
Yellow seed
Synthesis of leading and lagging strand require
- (a)
Single primer
- (b)
Singel and many primers respectively
- (c)
Many and single primers respectively
- (d)
Many primers
What is true for E. coli with inhibited lac-z gene?
- (a)
They cannot synthesize permease
- (b)
They cannot synthesize functional beta galactosidase
- (c)
They cannot synthesize transacetylase
- (d)
They cannot transport lactose from the medium into the cell
A: SNPs-pronounced "snips" are common in human being
R: It is minute variations that occurs at a frequency of one in every 300 bases.
- (a)
If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)
- (b)
If both Assertion & Reason are true and the reason is not the correct explanation of the assertion, then mark (2)
- (c)
If Assertion is true statement but Reason is false, then mark (3)
- (d)
If both Assertion & Reason are false statements, then mark (4)