WAEC Past Questions and Answers - Page 3498

17,486.

The diagram above is an illustration of one of the theories of evolution. Who proposed the theory in the illustration?

A.

Louis Pasteur

B.

Gregor Mendel

C.

Robert Hooke

D.

Jean Lamarck

Correct answer is D

This is the law of use and disuse propounded by Jean-Baptiste Lamarck.

17,487.

The chemical bond that holds the bases of the two strands of DNA together is

A.

oxygen bond

B.

hydrogen bond

C.

electrovalent bond

D.

covalent bond

Correct answer is B

Hydrogen bonds form between the nitrogenous bases in one strand and the nitrogenous bases in the other strand of DNA.

17,488.

A plant cell has 14 chromosomes prior to mitosis. What is the number of chromosomes in the daughter cells?

A.

14

B.

56

C.

28

D.

7

Correct answer is A

Mitosis is a process of cell reproduction in which one cell gives rise to two genetically identical daughter cells of the same number. Hence, the daughter cell has the same number as the parent cell prior to the process.

17,489.

Genes that remain linked are those

A.

close to each other on the chromosomes

B.

on the same locus on the chromosomes

C.

on the homologous chromosomes

D.

that are allelic pairs

Correct answer is A

Linked genes are genes that are found near each other on the same chromosome.