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Alleles are different versions of a gene. Every person has two alleles for each gene (one from either parent). For example, the gene which determines eye colour can either have an allele ...
When the population of a species is separated, each group is put under different selection pressures due to differing environments. In each population there is genetic variation, and more offspring are...
Transcription is the process by which a DNA sequence is copied into a complementary RNA sequence. RNA polymerase binds to the promoter region of the DNA chain and causes the unwinding and separation of...
The synapse is the junction between two neurons. When an action potential reaches the synaptic knob of a neuron, voltage-gate calcium channels are opened, causing an influx of positively charged calciu...
Eutrophication is the loss of oxygen in a body of water (e.g. pond or lake). This is usually due to algal bloom caused by artificial fertilisers and other chemicals being washed into the water by rain.The...
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