Biology - Genetics and Evolution
Exam Duration: 45 Mins Total Questions : 30
Cri-du-chat syndrome in humans is called by the
- (a)
fertilisation of an XX egg by a normal Y-bearing sperm
- (b)
loss of half of the short arm of chromosome 5
- (c)
loss of half of the long arm of chromosome 5
- (d)
trisomy of 21\(^{st}\) chromosome
Crossing over is the exchange of parts of chromosomes between two non-sister chromatids. Crossing over in diploid organism is responsible for
- (a)
linkage between genes
- (b)
recombination of genes
- (c)
segregation of alleles
- (d)
dominance of genes
Amino acid sequence in protein synthesis is decided by the sequence of
- (a)
tRNA
- (b)
mRNA
- (c)
cDNA
- (d)
rRNA
Which one of the following is not a living fossil?
- (a)
King crab
- (b)
Sphenodon
- (c)
Archaeopteryx
- (d)
Peripatus
The concept that 'population tends to increase geometrically,while food supply increases arithmetically was put forward by
- (a)
Adam Smith
- (b)
TR Malthus
- (c)
Stuart Mill
- (d)
Charles Darwin
In a random mating population in equilibrium, which of the following brings about a change in gene frequency in a non-directional manner?
- (a)
Migration
- (b)
Mutation
- (c)
Random drift
- (d)
Selection
Which of the plant was used by Mendel?
- (a)
Sweet pea
- (b)
Chick pea
- (c)
Garden pea
- (d)
Cow pea
Match the following
Column A | Column B | ||
1. | Dominant-Recessive | a. | Blood groups. |
2. | Incomplete dominance | b. | One form y linked and the other X linked. |
3. | Multiple alleles | c. | Heterozygote has phenotype intermediate between homozygous dominant and recessive. |
4. | Sex linked | d. | One allele may mask the other allel. |
- (a)
4a: 3b 1c :d2
- (b)
4a : 1b : 2c :3d
- (c)
4a: 3b : 2c :4d
- (d)
4a : 2b : 1c :3d
Which of the event signifies the transcription?
- (a)
Principle of complementarily pairing of bases
- (b)
Only one strand ofDNA is copied into RNA
- (c)
Only a segment of a DNA strand is copied into RNA
- (d)
The total amount of DNA of an organism is duplicated
Which one is incorrect statement?
- (a)
The DNA molecule has equal A - T and G - C base pairs
- (b)
Purines are always equal to pyrimidines
- (c)
The amount of Adenine is always equal to that of T and the amount of G is always equal to that of C
- (d)
The base ratio A+ T/G+C varies for a given species
In Hardy-Weinberg equation, the frequency of heterozygous individual is represented by
- (a)
p2
- (b)
2pq
- (c)
pq
- (d)
q2
The earliest fossil form in the phylogeny of horse is
- (a)
Merychippus
- (b)
Mesohippus
- (c)
Eohippus
- (d)
Equus
A colourblind woman marries a normal visioned male. In the offspring
- (a)
both son and daughter are colour blind
- (b)
all daughters are colour blind
- (c)
all-sons are normal
- (d)
all sons are colour blind
Given diagram represents the components of a transcription unit. Select the correct answer regarding it.
- (a)
A B C D Terminator Promoter Template strand Coding strand - (b)
A B C D Promoter Terminator Coding strand Template strand - (c)
A B C D Promoter Terminator Template strand Coding strand - (d)
A B C D Terminator Promoter Coding strand Template strand
Read the sequence of nucleotides in the given segment of mRNA and the respective amino acid sequence in the polypeptide chain to answer
Nucleotide sequence of the DNA strand from which this mRNA was transcribed is
- (a)
TAC AAA TAC GGA CAA AGA ATT
- (b)
AUG UUU AUG CCU GUU UCU UAA
- (c)
UAC AAA UAC GGA CAA AGA AUU
- (d)
ATG TTT ATG CCT GTT TCT TAA.
Which of the following is most important for speciation?
- (a)
Seasonal isolation
- (b)
Reproductive isolation
- (c)
Behavioural isolation
- (d)
Tropical isolation
The percentage of ab gamete produced by AaBb parent will be
- (a)
25%
- (b)
50%
- (c)
75%
- (d)
12.5%.
Assertion: Mendel conducted artificial pollination Reason: When two genes in a dihybrid are on the experiments for his genetic studies using true-breeding same chromosome, the proportion of parental gene pea lines. combinations are much higher than the non-parental
Reason: A true-breeding line shows the stable trait type. inheritance and expression for several generations.
- (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.
Assertion: Evolutionary trend is continuous changes of character in a lineage.
Reason: Lineage is an evolutionary sequence arranged in linear order.
- (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.
Which chromosome set is found in male hopper
- (a)
2A+XY
- (b)
2A+XO
- (c)
2A+YY
- (d)
2A+XX
If a hybrid DNA molecule is allowed to replicate twice in normal culture medium, the percentage of hybrid DNA will be
- (a)
50%
- (b)
12.5%
- (c)
25%
- (d)
75%
The one aspect which is not a salient feature of genetic code, is its being:
- (a)
Universal
- (b)
Specific
- (c)
Degenerate
- (d)
Ambiguous
An immature stop codon leads to :
- (a)
Mutation
- (b)
Non-sense mutation
- (c)
Variation
- (d)
Intron
Which of the following is incorrect sequence?
- (a)
Palaeozoic-Mesozoic-Coenozic
- (b)
Triassic-Jurassic-Cretaceous
- (c)
Silurian-Devonian-Carboniferous
- (d)
Devonian-Permian-Carboniferous
Choose the example of discontinuous distribution
- (a)
lung fidshes
- (b)
Egg laying mammals
- (c)
Pouched mammals
- (d)
All of these
Movement of ribosome on mRNA is called
- (a)
Transcription
- (b)
Translation
- (c)
Translocation
- (d)
Protein synthesis
Peripatus is a connecting link between
- (a)
Mollusca and Echinodermata
- (b)
Annedia and Arthropoda
- (c)
Coelenterata and Porifera
- (d)
Ctenophora and Platyhelminthes
How many true breeding pea plant varieties were selected by Mendel?
- (a)
14
- (b)
7
- (c)
21
- (d)
2
The reaction, Amino acid + ATP \(\rightarrow\) Aminoacyl-AMP + P-P depicts
- (a)
Amino acid assilmilation
- (b)
Amino acid transformation
- (c)
Amino acid activation
- (d)
Amino acid translocation
de Vries gave his mutation theory on organic evolution while working on
- (a)
Althea rosea
- (b)
Drosophila melanogaste
- (c)
Oenothera lamarckiana
- (d)
Pisum sativum