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Inherited vs Environmental

AQA GCSE Biology - B1.7.1

Peter Fearon

on 6 November 2011

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Transcript of Inherited vs Environmental

Inherited vs Environmental Key Terms continuous discontinuous environmental Characteristics height weight eye colour hair colour hair style tongue rolling ear lobe shape scars tattoos Inherited Characteristics These are characteristics that are passed on from the parents to the offspring in the genes. eye colour natural hair
colour tongue rolling blood type Controlled only by genes Environmental Characteristics These are characteristics that may be controlled by genes, but are also influenced by the way the individual lives their life Height Weight Scars/Tattoos The offspring of tall people are more likely to be tall. However, the offspring will only reach their height potential if they develop under certain conditions. Eg. Health care, nutrition, clean water etc. Whilst weight can be influenced by genetic factors in some people, the diet of the individual will determine their weight. Skin colour is determined, in part, by the skin colour of your parents, however, the condition of your skin is determined by your environment. Scars and tattoos are examples of characteristics that are soley controlled by your environment (or choices that you make). Continuous Variation Discontinuous Variation Lets look at the class: We need to collect data on three
characteristics from our class. Height Shoe size Gender Now that we have collected data on the class, we need to present it in graph form This is where individuals fall into a number of distinct classes or categories, and is based on features that cannot be measured across a complete range. You either have the characteristic or you don't. Blood groups are a good example: you are either one blood group or another - you can't be in between. Such data is called discrete (or categorical) data. Discontinuous variation is controlled by alleles of a single gene or a small number of genes. The environment has little effect on this type of variation. In continuous variation there is a complete range of measurements from one extreme to the other. Height is an example of continuous variation - individuals can have a complete range of heights, for example, 1.6, 1.61, 1.62, 1.625 etc metres high. Other examples of continuous variation include:
• Weight; Hand span; Shoe size; Milk yield in cows Continuous variation is the combined effect of many genes (known as polygenic inheritance) and is often significantly affected by environmental influences. Milk yield in cows, for example, is determined not only by their genetic make-up but is also significantly affected by environmental factors such as pasture quality and diet, weather, and the comfort of their surroundings.
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