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Juliette [100K]
2 years ago
14

Explain how a change in environment may result in selection becoming directional rather than stabilising

Biology
1 answer:
bulgar [2K]2 years ago
4 0
Under artificial selection.

Natural selection is always stabilising. When there is great selective pressure, it could look as if it is directional, but actually, the environment has changed so much that the entire ecological system is unstable, and evolution compensates and stabilises it. There’s no direction to this compensation, but more like throwing things at the wall and see what sticks.

Only in artificial selection is there a direction.
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Decide whether each statement describes saturated fat, unsaturated fat, or both saturated and unsaturated fats.
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Answer:

Statement 1.) Both saturated and unsaturated fats.

Statement 2.) Saturated fat

Statement 3.) Unsaturated fat

Statement 4.) Unsaturated fat

Statement 5.) Both saturated and unsaturated fats.

Statement 6.) Saturated fat.

Explanation:

Fatty acids are straight chain carbon compounds of varying lengths. It is an important component of lipid in plant and animals. All fats are known to contain nine calories per gram, therefore can add to the weight of an individual. There are two type of fatty acids which includes:

--> Saturated fatty acids: these are fatty acids that contains no double bonds making it solid at room temperature. They are usually found in animal products such as milk, cheese and meat. They are absorbed in the villi of small intestine after digestion. One of the disadvantages of consuming diet rich in saturated fat is Saturated fats might increase LDL cholesterol levels. These are the bad cholesterol which are affected by inhibiting the LDL receptor activities leading to its increase. This can lead to heart disease conditions.

--> Unsaturated fatty acids: These are fatty acids which may contain one or more double bonds making it liquid at room temperature. They are found in plant oil (omega 6) and fish oil (omega 3). When consumed, they are absorbed in the villi of small intestine and helps maintain a good balance of cholesterol in blood.

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Answer: 6CO2 + 6H2O -> C6H1206 + 6O2

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