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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 is depo...

Acceleration is defined as the rate of change of velocity. Since velocity is a vector quantity (it has both magnitude and direction) defined as speed in a particular direction, any change in either speed or ...

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 of the g...

Firstly, make sure that you understand and can remember the plot of the book. If you have not made summarising notes throughout the year, do not worry. Although your personal notes are better as they are mor...

Longitudinal studies are those which are carried out over a long period of time. Longitudinal studies can be problematic because, over time, participants may drop out. This is an issue because it leaves the ...