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Alleles are different versions of a gene. A gene is the piece of DNA which carries information in the form of a sequence of amino acids. For every gene that we have, we carry 2 alleles which could be the sam...

Genetic diversity within a population is the variety of different alleles (versions) of genes present, which lead to a variety of phenotypes. It is important for a number of reasons, such preventing inbreedi...

One sample of bacteria was grown in a nutrient broth containing light nitrogen (N 14 ) and one was grown in a broth with heavy nitrogen (N 15 ). The bacteria took up the nitrogen to make new nucleotides so i...

Think of tumour suppressor genes and oncogenes like the pedals used to operate a car. Oncogenes are mutated forms of proto-oncogenes. Normally, these proto-oncogenes act like the gas pedal, and allow the cel...

First of all, the stimulus (a change in environment) will cause the receptor in the skin to fire an action potential down the sensory neurone. The sensory neurone then reaches the relay neurone in the CNS (w...