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Beneficial mutation: those mutations which are advantageous also increase the fitness of the organism

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Beneficial mutation: those mutations which are advantageous also increase the fitness of the organism

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- Grey bears evolved to have grey coloured fur which beneficially blended with the forest foundations of taiga and less fur/fat layer which requires less fat diet.

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Beneficial mutation: those mutations which are advantageous also increase the fitness of the organism

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Beneficial mutation: those mutations which are advantageous also increase the fitness of the organism

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- Polar bears evolved from brown bears to have white coloured fur and thicker fur coats which allowed them to survive better in winter.

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Stabilizing Selection: when the average phenotype within a population is favoured by the environment 

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Stabilizing Selection: when the average phenotype within a population is favoured by the environment 

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Stabilizing Selection: when the average phenotype within a population is favoured by the environment 

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Stabilizing Selection: when the average phenotype within a population is favoured by the environment 

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Sympatric speciation: a new species can also evolve and become genetically isolated from a larger population gradually or suddenly.

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Sympatric speciation: a new species can also evolve and become genetically isolated from a larger population gradually or suddenly.

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- Due to the melting of ice there is a decrease in the number of walrus and seals. The grey bears can also feed on meat for protein and can gain energy from eating small mammals with less fat content.

# data[].attributes.headline
Sympatric speciation: a new species can also evolve and become genetically isolated from a larger population gradually or suddenly.

# data[].attributes.subject
Sympatric speciation: a new species can also evolve and become genetically isolated from a larger population gradually or suddenly.

# data[].attributes.body
- Polar bears rely on a very high fat diet which consists of the blubber of the seals.

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Bottleneck Effect: a dramatic reduction in population size.

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Bottleneck Effect: a dramatic reduction in population size.

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- Grey bears are not dependent on the ice and swimming capabilities for food availability and can easily hunt small mammals in the forest but unfortunately they have got less fur and less thick layer of fat in their bodies which makes it difficult to survive in ultra cold regions.

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Bottleneck Effect: a dramatic reduction in population size.

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Bottleneck Effect: a dramatic reduction in population size.

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- Polar bears are dramatically reduced due to food availability.

The reason is the environmental effects resulting in melting of ice in polar regions.

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White colored fur perfectly blends with the surroundings of the Arctic region.

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Grey coloured fur perfectly blends with the forest surroundings of the subarctic region.

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Circulatory System (type of heart system)

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Circulatory System (type of heart system)

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The four chambered heart system

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Circulatory System (type of heart system)

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Circulatory System (type of heart system)

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The four chambered heart system

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Respiratory System (alveoli, gills, tracheal, skin diffusion)

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Respiratory System (alveoli, gills, tracheal, skin diffusion)

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Alveoli

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Respiratory System (alveoli, gills, tracheal, skin diffusion)

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Respiratory System (alveoli, gills, tracheal, skin diffusion)

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Alveoli

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Digestive System / Method of Nutrition / Diet

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Digestive System / Method of Nutrition / Diet

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- Small mammals such as ducks and mule deer

- Vegetation such as berries and roots

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Digestive System / Method of Nutrition / Diet

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Digestive System / Method of Nutrition / Diet

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- Walrus or seals

- Vegetation such as berries and seaweeds

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Predatory advantages or Defense Mechanisms

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Predatory advantages or Defense Mechanisms

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Grey coloured fur

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Predatory advantages or Defense Mechanisms

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Predatory advantages or Defense Mechanisms

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White coloured fur

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Taiga forest in subarctic region

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Arctic Region

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Ursus izetan

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Ursus maritimus