HEREDITY AND VARIATIONS - Jamb Biology Past Questions and Answers

Question 11:

• JAMB 1983

What is the genetic ratio of the F₂ generation if members of F generation are allowed to self-pollinate?

A. 1 tall : 3 short
B. 3 tall : 1 short
C. 1 tall : 1 short
D. 4 short : 0 tall
E. 4 tall : 0 short

Question 12:

• JAMB 1984

The character-producing factors in living organisms are

A. Chromomeres
B. Alleles
C. Chromatids
D. Chromosomes
E. Genes

Question 13:

• JAMB 1984

A man with normal haemoglobin (AA) marries a woman who has sickle-cell haemoglobin (SS). They have a child who has a sickle-cell trait. Which of the following genotypes could be associated with the child’s haemoglobin?

A. AA
B. OO
C. AO
D. AS
E. SS

Question 14:

• JAMB 1985

The hereditary material in a cell is known as

A. ADP
B. CNS
C. RNA
D. ATP
E. DNA

Question 15:

• JAMB 1986

If a woman who is a carrier of sickle cell trait (AS) married a man who is a sickler (SS) and they had four children, how many of them would be normal?

A. Three
B. Two
C. One
D. None