Jamb Biology Past Questions and Answers

Question 1741:

• 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 1742:

• 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 1743:

• 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 1744:

• 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

Question 1745:

• JAMB 2012

The short thick break in birds is an adaptation for

A. Crushing seeds
B. Sucking nectar
C. Tearing flash
D. Straining mud