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Environment and Phenotype Upper Sixth Biology. Aims To understand The effect of the environment on the phenotype Specific examples The function of the.

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Presentation on theme: "Environment and Phenotype Upper Sixth Biology. Aims To understand The effect of the environment on the phenotype Specific examples The function of the."— Presentation transcript:

1 Environment and Phenotype Upper Sixth Biology

2 Aims To understand The effect of the environment on the phenotype Specific examples The function of the lac operon in E coli

3 Phenotype Phenotype = Genotype + environment Height in humans Fur colour in the Himalayan rabbit Many characteristics are determined by the information help in the genes and also the environment

4 The lac Operon in E coli E coli is a bacteria normally found in the gut It needs enzymes to carry out the breakdown of nutrients Lactose permease, Β galactosidase The expression of these genes depends on the environment If the bacteria is grown in glucose, it doesn’t produce either If grown in lactose, both genes are expressed

5 Some work SAQ 4.22 please, in your books Why waste the resources to make enzymes that you don’t need?

6 The lac operon What is an operon? A length of DNA that holds the base pairs of a structural gene (one that makes a protein) and another base sequence which determines whether or not the mRNA to make the structural genes are transcribed or not.

7 Lac operon Lactose present

8 The lac Operon in E coli- no lactose present

9 Lac operon Animation Lac operon

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