HEREDITY AND VARIATIONS - Jamb Biology Past Questions and Answers

Question 31:

• JAMB 1991

Which of the following characters is NOT sex-linked?

A. River blindness
B. Baldness
C. Haemophilia
D. Colour blindness

Question 32:

• JAMB 1992

Which of the following is true of the children of a heamophilic man who marries a woman that is not haemophilic and does not carry the trait?

A. All their sons will be haemophlic
B. All their daughters will be haemophilic
C. All their daughters will be carriers
D. All their sons will be carriers

Question 33:

• JAMB 1992

A child with blood group genotype different from those of both parents and with a mother of genotype OO, can only have a father of genotype

A. A
B. B
C. AB
D. OO

Question 34:

• JAMB 1992

If R and r, denotes the genes for a character, the offspring of the cross between RR and Rr are

A. RR, 2Rr, rr
B. 2RR, 2rr, 2rr
C. 2RR, 2Rr
D. 4Rr

Question 35:

• JAMB 1992

A mammal with red fur and long ears was crossed with another having white fur and short ears. If the offspring had a red fur and short ears, the

A. Character are linked
B. Character are not linked
C. Parents are related
D. Parents are not related