HEREDITY AND VARIATIONS - Jamb Biology Past Questions and Answers

Question 86:

• JAMB 2008

Which of the following is a major cause of variation among organisms?

A. Inbreeding
B. Backcrossing
C. Sexual reproduction
D. Gene dominance

Question 87:

• JAMB 2008

In the diagram, which of the four offspring of the cross will be sort if T the gene for tallness is

A. I
B. Ii
C. Iii
D. Iv

Question 88:

• JAMB 2008

In the diagram, the genotypic ratio of the offspring of the cross is

A. 1:2
B. 1:2:1
C. 1:1:1:1
D. 3:1

Question 89:

• JAMB 2009

A phenotypic character with intermediate forms that can be graded from one extreme to the other is referred to as

A. Discontinuous variation
B. Continuous variation
C. A mutant
D. A genome

Question 90:

• JAMB 2009

In Mendelian inheritance, discontinuous characters are controlled by the

A. Centromeres
B. Alleles
C. Chromosomes
D. Chromatids