HEREDITY AND VARIATIONS - Jamb Biology Past Questions and Answers

Question 91:

• JAMB 2009

A woman with the ability to roll her tongue (Tt) marries a man who cannot roll his tongue(tt). what is the probability of each of their children being a tongue roller?

A. 100%
B. 75%
C. 50%
D. 25%

Question 92:

• JAMB 2009

A health condition that is known to have resulted from gene mutation is

A. Haemophilia
B. Colour blindness
C. Sickle-cell anaemia
D. Anaemia

Question 93:

• JAMB 2009

According to Darwin, the driving force behind evolutionary change is

A. Natural selection
B. Genetic drift
C. Mutation
D. Gene flow

Question 94:

• JAMB 2010

A dilute solution of phenylthiocarbamide tastes bitter to some people and is tasteless to others. This is an example of

A. Taste bud variation
B. Discontinuous variation
C. Morphological variation
D. Continuous variation

Question 95:

• JAMB 2010

A pair of genes that control a trait is referred to as

A. An allele
B. Recessive
C. Dominant
D. A hybird