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Alleles are different forms of the same gene which are located on the same part of the chromosome. 

Genes are made up of information needed to produce different proteins, so allele...

Mitosis occurs in a continuous, sequential order and has 5 stages:
1) Prophase
2) Metaphase
3) Anaphase
4) Telophase. 
Interphase
Interphase occurs before Mi...

Leaching from the excessive use of fertilisers causes a nutrient build up in neighbouring rivers or lakes. As a result of the increased nutrients plants within the lake or river grow rapidly, including al...

The main parts of the digestive system are the...

- mouth

- oesophagus

- stomach

- liver

- gall bladder

- panc...

Neurones can either be myelinated - they are sorrounded by a myelin sheath, or unmyelinated - they are not surrounded by a myelin sheath.
The myelin sheath is made up of Schwann cells and there are g...