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5. The guppy (Poecilia reticulata) is a small tropical fish. They are predated upon by various larger fish species.The males (top in picture) have great variation in the number and colour of spots on their body, ranging from one small spot to several spots and a grey colour to a variety of bright colours (pigment polymorphism). Males with brighter colours have greater breeding success
John Endler observed wild guppy populations and conducted several investigations on guppy populations in rivers with high levels and low levels of predation.In one investigation, he moved grey coloured males from a stream with high rates of predation to a stream with less predation.

题组内容描述:
5. The guppy (Poecilia reticulata) is a small tropical fish. They are predated upon by various larger fish species.The males (top in picture) have great variation in the number and colour of spots on their body, ranging from one small spot to several spots and a grey colour to a variety of bright colours (pigment polymorphism). Males with brighter colours have greater breeding success
John Endler observed wild guppy populations and conducted several investigations on guppy populations in rivers with high levels and low levels of predation.In one investigation, he moved grey coloured males from a stream with high rates of predation to a stream with less predation.

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6. Explain how the following factors contribute to natural selection within a population.

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6. Explain how the following factors contribute to natural selection within a population.

题组内容描述:
6. Explain how the following factors contribute to natural selection within a population.

题组内容描述:
6. Explain how the following factors contribute to natural selection within a population.

题组内容描述:
6. Explain how the following factors contribute to natural selection within a population.

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7. Phenylketonuria, PKU, is a metabolic disorder caused by a recessive allele which produces a non-functioning enzyme causing a build-up of the amino acid phenylalanine.In Finland, 1 in 200,000 babies are born with the disorder.

题组内容描述:
7. Phenylketonuria, PKU, is a metabolic disorder caused by a recessive allele which produces a non-functioning enzyme causing a build-up of the amino acid phenylalanine.In Finland, 1 in 200,000 babies are born with the disorder.