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WorksheetsREVISION UPS 2
Total questions: 58
Worksheet time: 45mins
Which of the following is heterozygous?
MM
Mm
mm
Which of the following is homozygous dominant?
RR
Rr
rr
Which of the following is homozygous recessive?
PP
Pp
pp
Which term denotes the combination of genes an organism has?
genotpye
phenotype
heterozygous
homozygous
Which of the following laws claims that alleles will separate during meiosis, one going to half the sex cells, the other allele going to the other half.
Law of Independent assortment
Law of Segregation
Law of Speciation
Law of Genetics
Which of the following laws claims that alleles will come together independently of each other in the offspring?
Law of Independent Assortment
Law of Segregation
Law of Typical Collection
Law of Assorted Assignment
If Y (yellow) is the dominant allele for pea plant seed color, which of the following would produce green seeds?
yy
Yy
YY
gg
What is the chance that two white flower (pp) pea plants could produce a purple flower pea plant?
0%
25%
50%
75%
what is the purpose of testcross?
To determine the recessive genotype of the parent
To determine the unknown recessive genotype of the parent
To determine whether one parent is heterozygous or homo dominant
To determine whether one parent is heterozygous or homo recessive
In monohybrid cross, if a parent is heterozygous and is test-crossed, the phenotypic ratio for their progeny would be:
3 : 1
1 : 1
2: 1
9 : 3 : 3 : 1
The monohybrid self-cross GENOTYPIC ratio is:
3 : 1
1 : 2 : 1
1: 1 : 1 : 1
9: 3 : 3 : 1
A cross between true breeding dominant and a true breeding recessive individuals in DIHYBRID cross will produce _________ individuals.
Homozygous dominant
Heterozygous
Homozygous recessive
Incomplete Dominant
P is dominant purple allele for flower colour where as Y is dominant yellow allele for seed colour. The genotype of a white flower with yellow seed is....
PpYy
ppYy
Ppyy
ppyy
A parent with PpYy genotype is testcrossed. The expected genotypic ratio of the progenies would be:
1 : 1 ; 1 : 1
9 : 3 : 3 : 1
3 : 1
1 : 1
A parent with YySs genotype is testcrossed. All these are the expected genotypes of the progenies, EXCEPT
YySs
yySs
Yyss
yySS
9 : 3 : 3 : 1 ratio is called ____________ ratio
Mendelian Monohybrid Self-cross
Mendelian Monohybrid test-cross
Mendelian Dihybrid Self-cross
Mendelian Dihybrid test-cross
True breed red flower is crossed with true breed white flower. If the progenies show intermediate characteristics of both parents, this phenomenon is called
Codominance
Incomplete dominance
Sex-linked gene
Linked gene
The example of codominance in real world is
MN blood antigen
Skin colour
Height
Weight
A person that is heterozygous to blood type A mates with a person with blood type O. The percentage of their children to be blood type A is _______
50%
25%
75%
100%
A child is born with a blood type O. The parents would be
One is Homozygous to A and one has AB type blood
one is Homozygous to A and one is dominant B blood
Both are heterozygous to both type A and B
One is heterozygous to blood type B and one is dominant to A
The probability for a son to suffer from Haemophilia from a carrier mother and a normal dad is
25%
50%
0%
75%
Linked genes can be defined as
Genes that are located near to each other on the same chromosome
Genes that are located near to each other on the different chromosome
If a number of recombinant progeny is so small, it shows that
The meiosis does not occur efficiently
There is a very small distance between genes
There is a huge chance of crossing over happened
Genes are not linked to each other
Distance between gene Q and R is 20; T and R is 3; R and S is 14, the gene map of the genes would be
Q----S------T-----R
Q-----T-----S-----R
Q-----S------R-----T
Q----R----T------S
In Hardy-Weinberg equation, p2 represents
the frequency of homozygous dominant
the frequency of dominant allele
the frequency of dominant phenotype
the frequency of recessive allele
The frequency of B allele in a population at genetic equilibrium is 0.7. What is the frequency of heterozygous?
0.42
0.21
0.49
0.7
The genotype frequency of a mutant which is homozygous recessive is 0.16. What is the frequency of the mutant allele?
0.4
0.84
0.6
0.32
Frequency of albinism (controlled by allele a) is one for every 40000 individuals. What is the percentage of allele a?
0.5%
0.05%
5.00%
50.00%
16% of mice in a population is albino. The frequency of dominant allele is
0.6
0.4
0.4
0.7
49% of individuals cannot taste PTC. What is the frequency of dominant allele?
0.3
0.4
0.6
0.7
The haemophilia allele is a recessive, sex-linked allele. In a population that is in Hardy-Weinberg equilibrium, the frequency of the recessive allele is 2%. How many haemophilia carriers are there in the population?
0.04%
1.96%
3.92%
9.6%
In a population of 700 hamsters, 543 have brown fur. The allele for brown fur B is dominant over yellow fur. In percentage, what is the frequency of heterozygous hamster in the population?
47.4%
52.6%
49.9%
32.3%
In a population of humans in Africa, 1% of its individual suffers from sickle-cell anaemia. What percentage of individuals that is homozygous dominant?
81%
18%
36%
90%
About 1 over 5000 are affected by cystic fibrosis. Calculate the frequency of carriers.
0.014
0.028
0.986
0.819
In a population, 960 out of 1000 individuals are not suffering from cystic fibrosis. Calculate the allele frequency that cause cystic fibrosis.
0.2
0.02
0.4
0.8
If 2 person in 4000 births in one country are the babies with cystic fibrosis, what is the chance that any one person is heterozygous to this disease?
2.24%
0.05%
4.38%
3.92%
The enzyme that unwinds the DNA to prepare for replication
helicase
replicase
DNA polymerase
Ligase
DNA replication results in two DNA molecules,
each one with two original strands
each one with two new strands
each one with one new strand and one original strand
one with two new strands and the other with two original strands
Which enzyme is responsible for adding nucleotides during elongation phase?
Topoisomerase
DNA Polymerase III
Ligase
DNA Polymerase I
In the absence of SSBP, the DNA that is opened by helicase will
Re-wind
Uncoil
Break
Unpair
The Okazaki fragments are present in
Leading strand
Lagging strand
Complementary strand
Sense strand
RNA differs from DNA because of these, except.
The presence of uracil base
Ribose sugar instead of deoxyribose
Single-stranded molecule
The presence of phosphodiester bonds between nucleotides
the mRNA produced from transcription represents
the template strand of DNA
the complementary strand of DNA
the antisense strand of DNA
the sense strand of DNA
The mRNA bases that complement to these bases 5'- A G C T A - 3' of template strand are
5' - U C G A U -3'
5' - U A G C U -3'
5' - A G C U A -3'
5' - A U C G A - 3'
The bases of the mRNA produced are 5' - U U A C G C -3', the coding strand presence in the DNA during transcription are
5'- T T A C G C -3'
5'- C G C A T T -3'
5'- A A T G C G -3'
5'- C G C T A A-3'
These RNAs are present in translation process., except
Ribosomes
amino acyl- tRNA
single strand RNA
messenger RNA
what amino acid is brought by initiator tRNA to the AUG codon?
methionine
methiorine
methanine
methamine
These are codons present in mRNA in 5' - 3' : G U C and A C G. The anticodons in 5' - 3' for them would be:
5' - - G A C and C G U - - 3'
5' - - G A C and U G C - - 3'
5' - - C A G and C G U - - 3'
5' - - C A G and U G C - - 3'
The tRNA that carries growing polypeptide will be in _______ site of large ribosomal subunit during translocation of ribosomes along the mRNA.
E site
P site
A site
T site
Which of these are NOT "Stop" codons?
UAG
UAA
UGA
AUG
In termination phase, the release factor in translation....
Will hydrolyse the bond between the tRNA and the growing polypeptide
Will hydrolyse the bond between the growing polypeptide
Will hydrolyse the bond between the mRNA and the growing polypeptide
Will hydrolyse the bond between the tRNA and the mRNA
In lac operon, lacY encodes for
B-galactosidase
lactose permease
transacetylase
acetyl-CoA
Which of these proteins are the "switch" who controls the lac operon?
Repressor protein
B-galactosidase
Lactose permease
Transacetylase
In the absence of lactose,
the repressor bind to the regulatory region, and switch off the operon
the repressor bind to the regulatory region, and switch on the operon
the activator bind to the regulatory region, and switch off the operon
the activator bind to the regulatory region, and switch on the operon
Binding of allolactose to repressor protein will change its (a) . (Clue: other term for shape)
The role of allolactose in lac operon
inducer
switch
starter
changer
