Chp 6-Genes

Question 1

What is a chromosome ?

Answer 1

A linear strand of DNA

Question 2

What are genes ?

Answer 2

A section of chromosomes which codes for a particular protein

Question 3

Human have —– different chromosomes

Answer 3

23

Question 4

What is Mutation ?

Answer 4

Mutation is a change in the DNA of an organism.Mutation in gametes can be passed to the next generation but in the normal cells, may or may not be dangerous.

Question 5

What can cause mutation ?

Answer 5

Chemicals, x-ray, gamma-ray, ionizing radiations.

Question 6

What are different types of mutation ?

Answer 6

A-
1)Insertion : Additional base (Frameshift)
2)Deletion : The deletion of a base(Frameshift)
3)Substitution: The change of one base with another base
B-
1)Nonsense 2)Missense

Question 7

What are alleles ?

Answer 7

Different forms of the same gene

Question 8

What are the strands of a chromosome called and what is holding them together ?

Answer 8

Chromatid,centromere