Variation due to genetic causes is inherited variation. A person or an animal receives half of their features from each parent. This means that a person will look a little like the father and a little like the mother. E.g
Eye colour
Hair colour
Skin colour
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Environmental variation
Charateristics of animal and plant species can be affected by factors such as:
Climate
Diet
Culture
Lifestyle
Language
Religion
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Continuous variation
This is shown in a line graph and are normally to do with population, height and weight seeing as there is a trend
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Discontinuous variation
This is shown in a bar graph and is normally to do with hair and eye colour because there are categories.
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Mutations
These are a change in the amount or type of DNA and can happen at random. However sometimes they can be harmful.
Can cause Down's Syndrome
Cystic Fibrosis can be caused by a recessive gene
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Cystic Fibrosis
Gene therapy can be used for people with Cystic Fibrosis, this is where copies of a normal allele are inserted into the chromosome of an indiviual who carries the faulty allele. These alleles are inhaled into the lungs.
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Sexual reproduction
This produces offspring that resembles the parents but are not identical.
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Asexual reproduction
Produces offspring which are genetically identical to the parent (clone)
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Gregor Mendel
Did the pea plant experiments and discovered that there were things called factors that controlled the way we are, called genes.
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Evolution
This theory is supported by evidence from fossils and by rapid changes that can be seen to occur in microogranisms such as antibiotic resistant bacteria.
The theory states that different species have developed over time from simple life forms.
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