HEREDITY AND VARIATIONS - Jamb Biology Past Questions and Answers

Question 21:

• JAMB 1987

In which of the following crosses will all the female offspring be colour blind?

A. Colour blind mother x colour blind father
B. Colour blind mother x normal father
C. Carrier mother x colour blind father
D. Carrier mother x normal father

Question 22:

• JAMB 1988

If a dark-skinned woman (Bb) marries an albino man (bb) and they have four children, how many of the children will be dark-skinned?

A. 3
B. 2
C. 1
D. None

Question 23:

• JAMB 1988

A red-coloured flower when crossed with a white-coloured one produced pink flowers. This is an example of

A. Complete dominance
B. Blending inheritance
C. Interaction of genes
D. Back crossing

Question 24:

• JAMB 1989

when the two alleles present in an organism are of the same type, the genotype is described as

A. Heterozygous
B. Heterogamous
C. Homozygous
D. Homologous

Question 25:

• JAMB 1989

If parents with blood groups AB and O produce six children

A. Three of them will have group B
B. Two of them will have group A
C. All the offspring will have group O
D. None of them will have group A