HEREDITY AND VARIATIONS - Jamb Biology Past Questions and Answers

Question 111:

• JAMB 2014

A couple has 10 children, all female. Which of the following best explains the situation

A. The sex determination was by the man's X chromosome
B. The man's sperm count is low
C. The woman is not capable of producing male children
D. The sex determination was by the man's Y chromosome

Question 112:

• JAMB 2016

If the cross of a red-flowered plant with a white flowered plant produces a pink flowered plant, this is an example of

A. Codominance
B. Incomplete dominance
C. Mutation
D. Linkage

Question 113:

• JAMB 2016

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

A. Croos breeding
B. Polygenic inheritance
C. Non-disjunctin
D. Inbreeding

Question 114:

• JAMB 2016

The hereditary characters in plants and animals are located on the

A. Gene
B. Mucleus
C. Chromosome
D. Cell

Question 115:

• JAMB 2016

When sickle cell carrier marries a normal woman, the probability of them having a normal offspring is

A. 0.75
B. 0.25
C. 0.5
D. .1