HEREDITY AND VARIATIONS - Jamb Biology Past Questions and Answers

Question 101:

• JAMB 2011

The crossing of individuals of the same species with different genetic characters is

A. Cross breeding
B. Polygenic inheritance
C. Non-disjunction
D. Inbreeding

Question 102:

• JAMB 2011

The number of alleles controlling blood groups in humans

A. 3
B. 4
C. 5
D. 2

Question 103:

• JAMB 2011

The wings of a bat and those of a bird are examples of

A. Convergent evolution
B. Continuous variation
C. Coevolution
D. Divergent evolution

Question 104:

• JAMB 2012

A yellow maize is planted and all the fruits obtained are of yellow seeds. When they are croos-bred, yellow seeds and white seeds are obtained in a ratio 3:1 . The yellow seed is said to be

A. Non-heritable
B. Sex-linked
C. A recessive trait
D. A dominant trait

Question 105:

• JAMB 2012

When a colour-blind man marries a carrier woman. What is the probability of their offspring being colour blind?

A. 25%
B. 50%
C. 75%
D. 100%