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Class 10 Practice - Level 2 - Heredity And Evolution - Set 1
Total questions: 25
1.
In a monohybrid cross of a homozygous dominant and a homozygous recessive parent, what is the expected genotype ratio in the F2 generation?
Topic:
Heredity
1:2:1
3:1
1:1
9:3:3:1
None
2.
What is the significance of the Hardy-Weinberg principle in evolution?
Topic:
Evolution
It explains genetic drift.
It describes the process of natural selection.
It provides a model for a non-evolving population.
It outlines the mechanism of gene flow.
None
3.
Which process during meiosis increases genetic variation by exchanging segments of DNA between homologous chromosomes?
Topic:
Heredity
Mutation
Crossing over
Independent assortment
Random fertilization
None
4.
Which of the following mechanisms can lead to speciation in geographically isolated populations?
Topic:
Evolution
Gene flow
Genetic drift
Sympatric speciation
Sexual selection
None
5.
What does a pedigree chart help to determine in genetics?
Topic:
Heredity
The occurrence of mutations
The inheritance pattern of a trait
The environmental influences on traits
The evolutionary history of a species
None
6.
Which of the following best describes adaptive radiation?
Topic:
Evolution
The gradual change of species over time
The extinction of a species
The rapid evolution of diversely adapted species from a common ancestor
The convergence of different species into a similar form
None
7.
In a dihybrid cross involving two heterozygous parents (AaBb), what is the expected phenotypic ratio in the F2 generation?
Topic:
Heredity
9:3:3:1
3:1
1:2:1
1:1:1:1
None
8.
Which type of selection favours individuals with extreme phenotypes over those with intermediate phenotypes?
Topic:
Evolution
Stabilizing selection
Directional selection
Disruptive selection
Balancing selection
None
9.
What is the role of ribosomal RNA (rRNA) in the process of translation?
Topic:
Heredity
It carries amino acids to the ribosome.
It brings the genetic code from DNA to ribosomes.
It catalyzes the formation of peptide bonds.
It forms the structural and functional components of ribosomes.
None
10.
Which of the following is an example of a postzygotic reproductive barrier?
Topic:
Evolution
Temporal isolation
Behavioural isolation
Hybrid sterility
Geographical isolation
None
11.
In the context of genetics, what is a linkage group?
Topic:
Heredity
A group of genes on different chromosomes
A group of genes that are inherited independently
A group of genes located on the same chromosome that tend to be inherited together
A group of genes that cause the same phenotype
None
12.
Which of the following best explains the bottleneck effect?
Topic:
Evolution
The movement of individuals between populations
The formation of new species due to isolation
The drastic reduction in population size due to environmental events, leading to genetic drift
The adaptation of organisms to their environment
None
13.
What is the significance of the lac operon in prokaryotic gene regulation?
Topic:
Heredity
It regulates the synthesis of RNA.
It controls the replication of DNA.
It regulates the metabolism of lactose in bacteria.
It ensures proper cell division.
None
14.
Which of the following is an example of coevolution?
Topic:
Evolution
The development of antibiotic resistance in bacteria
The evolution of longer necks in giraffes
The mutual adaptations of flowering plants and their pollinators
The convergence of shark and dolphin body shapes
None
15.
What is the function of telomeres in eukaryotic chromosomes?
Topic:
Heredity
They code for proteins.
They act as origins of replication.
They protect the ends of chromosomes from deterioration.
They are involved in chromosome pairing during meiosis.
None
16.
Which type of natural selection results in a population with a higher frequency of a particular phenotype over time?
Topic:
Evolution
Disruptive selection
Stabilizing selection
Directional selection
Sexual selection
None
17.
What is the purpose of a test cross in genetics?
Topic:
Heredity
To determine the phenotypic ratio of offspring
To identify the genotype of an organism with a dominant phenotype
To study the inheritance pattern of a single trait
To measure the rate of mutation in a population
None
18.
Which of the following is an example of gene flow?
Topic:
Evolution
A population bottleneck
A mutation in a gene
The movement of alleles between populations through migration
The random fluctuation of allele frequencies
None
19.
What is genetic recombination and why is it important?
Topic:
Heredity
The process of copying DNA
The exchange of genetic material between different chromosomes during meiosis
The random mutation of genes
The cloning of organisms
None
20.
Which of the following best describes the founder effect?
Topic:
Evolution
The random changes in allele frequencies due to genetic drift
The selective breeding of organisms for desired traits
The establishment of a new population by a small group of individuals, leading to reduced genetic variation
The adaptation of organisms to their environment
None
21.
In a pedigree chart, what does a square symbolize?
Topic:
Heredity
A female
A male
An affected individual
A carrier
None
22.
Which of the following is an example of convergent evolution?
Topic:
Evolution
The wings of bats and birds
The development of antibiotic resistance in bacteria
The homologous structures of vertebrate limbs
The similar body shape of sharks and dolphins
None
23.
What is a genetic locus?
Topic:
Heredity
A protein that binds DNA
The physical location of a gene on a chromosome
A type of genetic mutation
A section of non-coding DNA
None
24.
Which of the following mechanisms is most likely to increase genetic variation in a population?
Topic:
Evolution
Genetic drift
Inbreeding
Natural selection
Mutation
None
25.
How does incomplete dominance differ from complete dominance in genetics?
Topic:
Heredity
Both alleles in a gene pair are fully expressed in incomplete dominance.
One allele is not completely dominant over the other in incomplete dominance, resulting in a blended phenotype.
The dominant allele completely masks the recessive allele in incomplete dominance.
Incomplete dominance involves the interaction of multiple genes.
None
1 out of 25
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