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Once a month, following ripening, a single egg is released from a woman's ovaries during the menstrual cycle, with the hope of fertilisation. During the act of sexual reproduction, the father's sperm i...

A gene is a section of DNA or RNA that codes for a protein. Alleles are different versions of the gene.  For example, if a gene coding for a particular enzyme mutated, then there would be two alleles o...

Genes, chromosomes and DNA are three vital components of cells and many students often confuse them with each other.

DNA stands for Deoxyribose Nucleic Acid. DNA molecule...

The nervous system and endocrine system work together to maintain a state of constancy in the body's internal environment despite changes in the external environment. The effect of both systems is ach...

There are several important differences betwe...