Jamb Biology 1995 Past Questions and Answers

Question 41:

• JAMB 1995

The specific number of chromosomes in each somatic cell is represented by

A. 2^N
B. 23
C. 2N
D. N

Question 42:

• JAMB 1995

A man with blood group a is married to a woman with blood group A. Which of the following group combinations is possible if the family has three children?

A. B, A, AB
B. O, A, B
C. B, AB, AB
D. A, O, A

Question 43:

• JAMB 1995

The F₁ of a cross between a tall and a dwarf plant was tall. The F₁ was advanced to F₂. How many of 120F₂ plants will be dwarf?

A. 30
B. 60
C. 90
D. 120

Question 44:

• JAMB 1995

All the sons of a colour-blind woman will be coloured blind regardless of the state of the father because

A. The egg determines the phenotype of the son
B. Sons inherit the sex chromosome of their mothers
C. The father's sex chromosomes is weaker in sons
D. Sex-linked traits express dominance in females

Question 45:

• JAMB 1995

The slender, long and slightly curved beak of the sun-bird is an adaptation for breeding for feeding on

A. Nectar
B. Small seeds
C. Big seeds
D. Insects