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Heston (1966) – study whether schizophrenia is genetic or not with adopted children, assuming if there are any physical and behavioural similarities between offspring and parents, that is due to genet...

·      Changes in genotype (genetic evolution via natural selection) have lead to cultural evolution in humans by promoting intelligent behaviour

·      L...

Incompleteness of the Fossil Record

▪       Fossilisation is an exceptionally rare occurrence that requires an unusual combination of special condi...

A polymorphism is the occurrence of two or more clearly different phenotypes within the same population of a species - it reflects the effects of more than one allele in the gene pool

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·      Sound travels as pressure waves in the air which push the membrane of the eardrum, causing it to vibrate. The degree of vibration will vary according to the frequen...