EXERCISE (mutation)

1. Mutation is a change which occur spontaneously in chromosome or gene.

2. Name two types of mutation

a) Chromosome mutation
b) Gene mutation

3. Identify the following disorders that caused by chromosome mutation:


a) A person who has three sex chromosome (XXY) instead of the usual two
sex chromosome (XY)
Klinefelter’s syndrome

b) A female who has only X chromosome (XO)
Turner’s syndrome

c) He/she has an extra chromosome 21. This person has 47 chromosomes
in somatic cell instead of the normal person.
Down’s syndrome

4. Gene mutation is due to chemical changes in individual gene.

5. List the consequences of gene mutation.

a) colour-blindness
b) albinism
c)haemophilia
d)thalasseamia

6. Complete the schematic diagram of colour-blindness below:

Keys: X : X chromosome which carries the normal gene
X : X chromosome which carries the recessive gene for colour-blindness


Parent : father X mother


Meiosis

Gametes:

Fertilization


Baby: