Genetic Changes through Generations

Q.

What is an example of a mutation in evolution?

Q. Read the following statements and identify the correct option that is a criticism of Darwin’s theory of evolution.

A. Darwinism explains the arrival of the fittest
B. Darwinism did not explain the evolution of terrestrial animals from aquatic forms
C. It explains the presence of vestigial organs
D. Darwinism did not differentiate between somatic and germinal variations

1. A, B and C are correct
2. B and D are correct
3. A, C and D are correct
4. A and C are correct

Q. The theory of evolution by natural selection was independently developed by

1. Charles Lynn and Charles Darwin
2. Charles Darwin and Alfred Wallace
3. Joseph Dalton Hooker and Lamarck
4. Charles Lynn and James Hutton

Q. Which of the following is the closest relative of man?

1. Chimpanzee
2. Gorilla
3. Orangutan
4. Gibbon

Q. Mendelian disorders are caused by

1. mutation in the single chromosome
2. mutation in the single gene
3. mutation in the germplasm
4. mutation in the genome

Q.

_____________propounded the theory of Natural Selection.

Q.

What is an example of a mutation?

Q.

The phenomenon of "Industrial melanism" shows:

1. Reproductive isolation

2. Induced Mutation

3. Geographical isolation

4. Natural selection

Q.

Do new mutations arise In somatic cells or germ cells?

Q.

Why is biological evolution explained as descent with modification?

Q.

Mutations which arise suddenly in nature are called

1. Spontaneous mutations

2. Chromosomal mutations

3. Induced mutations

4. Gene mutations

Q.

What is Darwins natural selection?

Q. Match List I with List II and select the correct option.

List I	List II
A. Darwin	I. Mutation theory
B. Hugo de Vries	II. Theory of inheritance of acquired characters
C. Lamarck	III. Natural selection theory

1. A - I, B - III, C- II
2. A - II, B - I, C- III
3. A - III, B - I, C- II
4. A - III, B - II, C- I

Q. Which of the following causes point mutation?

1. Deletion
2. Inversion
3. Both A and B
4. None of the above

Q.

Is Darwinism the same as evolution?

Q. Mutation is deemed as a necessary evil because

1. it can lead to speciation
2. it can lead to extinction
3. it can lead to evolution
4. it can lead to adaptation

Q. The reason why some mutations, which are harmful do not get eliminated from gene pool is

1. They have future survival value.
2. They are recessive and carried by heterozygous individuals.
3. They are dominant and show up more frequently.
4. Genetic drift occurs because of a small population.

Q.

Which of the following is most important for speciation?

1. Seasonal isolation

2. Reproductive isolation

3. Behavioral isolation

4. Tropical isolation

Q. The inheritable characters vary in different species and within the same species. Name the variation in the following cases.
The dentition in the rabbit and the elephant are not the same. This is called as ____ variation.

Q. Mutagenic effect of X-rays was discovered by

1. Hugo de Vries
2. Morgan
3. Muller
4. Luria

Q. Which of the following(s) cause(s) mutation?

1. DNA replication
2. Chemical agents
3. Ionising radiation
4. Tissue damage

Q. Lethal mutations were first detected by

1. Morgan
2. Bateson
3. Muller
4. L. Cuenot
5. None of the above

Q. A geneticist interested in studying variations and patterns of inheritance in living beings prefers to choose organisms for experiments with shorter life cycle. Provide a reason.

Q. The inheritable characters vary in different species and within the same species. Name the variation in the following cases.
The eye colour among human beings are varied as blue, black, brown, green etc. This is called ______ variation.

Q.

Reason of diversity in living being is

1. Mutation

2. Long term evolutionary change

3. Gradual change

4. Short term evolutionary change

Q. Those species originated from common ancestor show more conserved sequence in genetic material than those of unrelated species.

1. False
2. True

Q.

Which of the following is most important for speciation?

1. Reproductive isolation

2. Behavioral isolation

3. Tropical isolation

4. Seasonal isolation

Q. When a mutation is limited to the substitution of one nucleotide for another, this type of mutation is called?

1. Translocation
2. Point mutation
3. Base inversion
4. Sugar phosphate deletion
5. Frame shift

Q. Which of the following is not true for a species?

1. Members of a species can interbreed
2. Variations occur among members of species
3. Each species is reproductively isolated from every other species
4. Gene flow does not occur between the populations of a species

Q. Which of the following is non-heritable?

1. Point mutation
2. Gene mutation
3. Somatic mutation
4. Chromosomal mutation