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Variation B1

What is variation? The genetic or environmental differences between organisms in a species.
How do genes cause genetic variation? • Characteristics determined by mix of genes inherited from mother and father • Passed on in gametes that develop offspring • Combination of genes from mother and father causes genetic variation- where no two types of the same species are similar
In animals which characteristics are only determined by genes? Eye colour, blood group and inherited disorders
How can characteristics also be affected by the environment? • Any difference in a species that has been caused by the condition they are living in is environmental variation
Give an example of an environmental variation. A plant receiving sunlight would grow better than a sun receiving less sunlight, the colour of and how much the plant grows is an environmental variation.
What characteristics are caused by a mixture of environmental and genetic variation?(5) • Weight • Skin colour • Height • Teeth condition • Strength
Give an example of how environmental variation affects genetic variation. The maximum height a person can grow to=genetic variation but environmental factors may affect how tall the person grows (food for example)
Created by: GuyBrazier



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