Mutation

Q.

Define Variation.

Q.

What are the advantages of mutations?

Q. What is induced mutation ?

Q.

What are the four types of mutations?

Q.

What is a biological change?

Q.

How do mutations cause evolution?

Q.

How does variation occur?

Q.

Which of the following is not true about mutations?

1. They are inherited.
2. Leads to evolution.
3. Not affected by the environment
4. (a) and (b) above.

Q.

Is blood type an example of pleiotropy?

Q.

_______is a protein pigment that is responsible for different skin colour in humans.

1. Hemoglobin

2. Melanin

3. Carotene

4. Chlorophyll

Q.

Which are the main causes of genetic variations?

1. Mutations

2. Sex

3. Gene flow

4. All the above

Q. Assertion (A): Without variations, evolution cannot happen.
Reason (R): Only useful variations are transmitted to the next generation.

1. Both A and R are true and R is the correct explanation of A
2. Both A and R are true but R is not the correct explanation of A
3. A is true but R is false
4. A is false but R is true

Q.

Is evolution just mutation?

Q.

State whether the statements are true or false.​
Variations are produced due to mutation.​

Q.

Genetic variations are caused by

1. Errors in DNA replication

2. Sudden changes in cytoplasm

3. Protein synthesis errors

4. Errors in RNA formation

Q. The Mutation Theory was put forward by

1. Francis Crick
2. James Watson
3. Hugo de Vries
4. Frederick Griffith

Q.

Mutation is any random genetic change that results in inheritable new traits.

1. True

2. False

Q.

A sudden or spontaneous change in the structure and action of a particular gene is called:

1. Linkage

2. Mutation

3. Variation

4. Allelomorphic

Q.

What is the reason for variation at the genetic level?

Q. All the mutations are harmful.

1. True
2. False

Q.

A mutation which substitutes one purine base with another purine base is called as?

1. Transversion
2. Transduction
3. Transfection
4. Transition

Q. Fill in the blank with the words given: Temperature, Chemicals, Nutrient, Water
Mutations in plants can be induced artificially by ___ .

Q.

Genetic variations are always advantageous.

1. False

2. True

Q. is a source of genetic variation in human beings.

1. Growth
2. Mitosis
3. Reproduction

Q. Which of the following are the main causes of genetic variations?

1. Mutations
2. Sexual reproduction
3. Gene flow
4. Mitosis

Q. De Vries postulated the theory of mutation by working on evening primrose.

1. True
2. False

Q. Mutations do not lead to variation in characters.

1. True
2. False

Q. Changes involving replacement of one pyrimidine with purine or vice versa are

1. Transversion
2. Transition
3. Reverse mutation
4. Point mutation

Q. Question 34
Give two reasons for the appearance of variations among the progeny formed by sexual reproduction.

Q. Write a short note on the theory of mutations.