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With A-level biology it is just as important to know how to answer the question and what the examiners are looking for as it is to have the knowledge to do so. There are common questions that examiners...

They are both cell divisions but there are major differences betwenn them. First of all, meiosis only happens in sex cells (egg cells in women and sperm cells in men) and is a reduction diviosion, i.e....

Speciation is a complex topic, and indeed what defines a species is still debated today. However, one factor is key to the process of speciation; gene flow. Gene flow between populations of a species e...

   Cystic Fibrosis is a genetic condition that results from defective chloride ion channels. Normally a protein known as the “Cystic Fibrosis Transmembrane conductance Regulator” (CFTR) transports chlo...

Cystic Fibrosis is caused by a mutation in the CFTR gene. The mutation causes a small change in the DNA's base sequence which codes for a different sequence of amino acids and therefore as a result, th...