Jamb Biology 2012 Past Questions and Answers

Question 31:

• JAMB 2012

The diseases caused by water-borne pathogens include

A. Gonorrhoea and poliomyelitis
B. Typhoid and syphilis
C. Tuberculosis and cholera
D. Typhoid and cholera

Question 32:

• JAMB 2012

Which of the following is true in blood transfusion?

A. Person of blood group AB can donate blood only to another person of blood group AB
B. Persons of blood groups A and B can donate or receive blood from each other
C. A person of blood group AB acn receive blood only from persons of blood group A or B
D. A person of blood group O can donate only to a person of blood group O

Question 33:

• JAMB 2012

A yellow maize is planted and all the fruits obtained are of yellow seeds. When they are croos-bred, yellow seeds and white seeds are obtained in a ratio 3:1 . The yellow seed is said to be

A. Non-heritable
B. Sex-linked
C. A recessive trait
D. A dominant trait

Question 34:

• JAMB 2012

When a colour-blind man marries a carrier woman. What is the probability of their offspring being colour blind?

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

Question 35:

• JAMB 2012

The correct base pairing for DNA is

A. Adenine → thymine and guanine → cytosine
B. Adenine → guanine and thymine → cytosine
C. Adenine → cytosine and guanine → thymine
D. Adenine → adenine and cytosine → cytosine