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Natural Selection Model by Abhishek Jaguessar

Apr 07, 2018

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    NATURAL SELECTION

    MODEL

    BY

    ABHISHEK JAGUESSAR

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    A population showingvariation in colour.

    Continuous or

    discontinuous?

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    There is lots of food so your population survives and

    reproduces. Add 5.

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    The bright yellow of some of your offspring attracts

    predators. All but two of them get eaten.

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    Theres lots of food and hiding places for the green and

    blue, but the red ones cant hide and get eaten.

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    Plenty of food and its spring so another 10 offspring

    are born, they are a variety of colours.

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    Plenty of food and its spring so another 10 offspring

    are born, they are a variety of colours.

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    Its winter and 5 of your population die

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    Its mating time again, blue and green mate and produce

    5 green and 2 blue offspring. A mutation also produces

    2 red offspring

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    Its mating time again, blue and green mate and produce

    5 green and 2 blue offspring. A mutation also produces

    2 red offspring

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    There is lots of food, and all reproduce 2 offspring, but

    the white are better at finding water and hiding from

    predators so they produce 5 offspring

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    There is lots of food, and all reproduce 2 offspring, but

    the white are better at finding water and hiding from

    predators so they produce 5 offspring

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    The bright red colour attracts mosquitoes carrying a

    deadly disease. They all die.

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    The bright red colour attracts mosquitoes carrying a

    deadly disease. They all die.

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    It is a particularly hot summer, blue and green are poor

    temperature regulators; white and yellow, which reflect

    heat, are more likely to survive.

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    It is a particularly hot summer, blue and

    green are poor temperature regulators;

    white and yellow, which reflect heat, are

    more likely to survive.

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    When food is plentiful again the remainder mate and

    produce 5 offspring some white and some yellow.

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    When food is plentiful again the remainder mate and

    produce 5 offspring some white and some yellow.

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    A scientist finds this population and reports that this

    species occurs in two colours. He says they have

    adapted to their habitat. What does he mean?

    What is the population?

    Has it changed?

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    In outline, Darwin stated the following:

    Many more individuals are born than can possibly survive.

    Individuals within a population vary slightly from one

    another.

    There is a frequent recurring struggle for existence.

    Some individuals will have a better chance of surviving

    than others (they will be naturally selected).

    Any selected variety will tend to propagate its form.

    Q.What did the individuals in our population compete for in

    the struggle to survive?

    Q.Which individuals were naturally selected?

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    Lamarck (a french biologist) proposed:

    During a life, structures or characteristics may be used or not

    used.

    Extensive use would lead to increased size and/or efficiency.

    Characteristics acquired during a lifetime could be inherited and

    so passed on to any offspring.

    Q.Does our population show any evidence to contradict or

    support Lamark?

    To test Lamarcks theory, Weismann cut off the tails of mice forsuccessive generations.

    Q.What should have happened if Lamarcks ideas were to be

    supported?

    Q.What do you think did happen?