2018 - WAEC Biology Past Questions and Answers - page 5

Crossing over is the process where homologous chromosomes pair up with each other and exchange different segments of genetic material to form recombinant chromosomes.

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

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.

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

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

The theory implies that the more you use a part of your body, with time that part of your body starts adjusting in order to make the work easy.

Some sedimentary rocks actually have fossils stored in them. Therefore, fossils are stored in rocks.

Social insects are characterized by Group integration (blending the new members into the already existing social structure), Division of labour and Overlap of generations (having several breeding seasons, hence having multiple generations present at a time).