Definition and Significance of Mutation

Q.

What is the role of mutation and recombination in evolution?

Q.

What is an example of deletion mutation?

Q.

What is the relationship between genetics and evolution?

Q.

Why does the face of a person become red in sunlight ?

Q.

What are the two main types of mutations?

Q.

What causes a deletion mutation?

Q.

What is mutation?

Q.

Question 31
A very small population of a species faces a greater threat of extinction than a larger population. Provide a suitable genetic explanation.

Q.

Which of the following are mutagens?

1. Gamma radiations.

2. X rays

3. UV rays

4. Tobacco smoking

Q.

What is the evolution factor?

Q. In a mutational event, when adenine is replaced by guanine, it is a case of

1. Transcription
2. Transition
3. Transversion
4. Frameshift mutation

Q.

________ is the sudden inheritable change in one or more genes.

1. dominance

2. homozygosity

3. hetrozygosity

4. mutation

Q. Deletion mutation can also cause frameshift mutation.

1. True
2. False

Q.

Which among the following is NOT true about mutations?

1. Mutation can cause cancer

2. Mutations are not always genetically inherited

3. Mutagens can be chemicals

4. Mutations are always inherited.

Q. Are evolution and speciation same?

Q.

Mutation is deemed as a necessary evil because:

1. It leads to extinction

2. All of the above

3. It leads to speciation

4. It leads to evolution

Q. Frameshift mutations are those in which

1. groups of three nucleotides get inserted or deleted
2. a few nucleotides (not in multiples of three) get inserted or deleted
3. a single nucleotide gets replaced by another
4. the reading frame of the nucleotide sequence does not get shifted

Q. Which one of the following is not important for evolution?

1. Mutation
2. Genetic drift
3. Recombination
4. Somatic variation

Q. Define the following terms: [3 MARKS]
(i) Genome
(ii) Mutation
(iii) Filial generation

Q.

There would be no evolution if:

1. The inheritance of acquired character did not take place

2. Somatic variations are inheritable

3. Genetic variations were not found among members of population

4. Somatic variation would not transform into genetic variations

Q. The Hardy - Weinberg equation is used to

1. Predict the alleles in the gene pool of the next generation.
2. Describe the genetic makeup of individuals in a population.
3. Predict an increase or decrease in the size of a population.
4. Determine the frequency of mutations

Q.

Statement 1: A blood disease caused by gene mutation is sickle cell anaemia.

Statement 2: It results in the production of sickle-shaped WBCs

1. Pigeon

2. Honeybee

3. Snapping turtle

4. Alligator

Q. Who proved DNA as a genetic material?

1. Griffith
2. Hershey and Chase
3. Bacteria
4. PPLO

Q. Mutations in plants can be induced artificially by

1. Temperature
2. Nutrient supply
3. Chemicals and radiations
4. Water

Q.

Mutation could lead to evolution of new species.

1. False
2. True

Q. __ causes gradual change in a species and leads to its evolution.

1. Genetic engineering
2. Mutation
3. Heridity
4. Genetic counselling

Q. What is speciation?

1. Extinction of species.
2. The dominance of one species over other.
3. Formation of new species.
4. All of these.

Q. All of the following statements are true of mutations except

1. Mutations are always harmful to the organism.
2. Mutations are the raw material for variation in species.
3. Mutations can create a selective advantage for an individual.
4. Mutations in gametes will be distributed throughout the entire organism.
5. Mutations in somatic cells can cause the cell cycle to malfunction.

Q. The ultimate source of variation is

1. Adaptability
2. Sexual variation
3. Mutation
4. Natural selection

Q.

Are humans still evolving today?