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A population of one species is separated by a physical barrier, e.g a geographical barrier such as the movement of tectonic plates. There will then be 2 isolated groups of the same species unable to inter...

Plant cells have chloroplasts, a vacuole and a cell wall.

Nucleus, mitochondria, ribosome, cytoplasm, cell membrane. 

1. In the nucleus of the cell, there are pairs of chromosomes which carry the same genes in the same places. 2) Alleles are different versions of these genes.3) For example, a person may have an allele...

Vaccination is an important method used in healthcare to prevent people from getting certain diseases. Vaccines contain a dead or weakened (attenuated) form of a pathogen, and the immune system res...