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What kind of selection is exerted on a p...

What kind of selection is exerted on a population if both the smallest-and largest-sized individuals contribute relatively fewer offspring to the next generation than individuals that are closer to the average size of individuals in the question?

A

Stabilizing selection

B

directional selection

C

disruptive selection

D

sexual selection

Text Solution

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The correct Answer is:
A
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Assertion: Disruptive selection changes the population towareds one particular direction. Reason: This type of selection favours average sized individuals.

What would be the percent growth or birth rate per individual per hour for the same population mentioned in the previous question (Question 10)?

Knowledge Check

  • An isolated population of humans with approximately equal numbers of blue-eyed and brown-eyed individuals was decimated by and earthquake. Only a few brown-eyed people remained to form the next generation. This kind of change in the gene pool is called a

    A
    Hardy-Weinberg equilibrium
    B
    blocked gene flow
    C
    bottle-neck effect
    D
    gene migration

  • What would be the percent growth or birth rate per individual per hour for the same population mentioned in the previous question (Question 10)?

    A
    100
    B
    200
    C
    50
    D
    150

  • Which of the following are necessary for evolution by natural selection to take place? (i) Offspring resemble their parents more than other individuals in the population. (ii) Differences among individuals exist and lead to different numbers of successful offspring being produced. (iii) Individuals adjust their development depending on the enviorment (iv) Every individual possess enormous fertillity.

    A
    i and ii
    B
    ii and iv
    C
    i,iii and iv
    D
    iii only

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    Read the following statements and select the correct option. (i) Increase in metained months after industrialisation in Great Britain is a proof for natural selection. (ii) When more individuals of a population acquire a mean character value, it is called disruption. (iii) Changes in allelic frequency in a population will lead to Hardy-Weinberg equilibrium. (iv) Genetic drift changes the existing gene or allelic frequency in future generations.

    Read the following statements and select the correct option A. Increase in melanised moths after industrialisation in Great Britain is a proof for natural selection B. When more individuals of a population acquire a mean character value, it is called disruption C. Changes in allelic frequency in a population will lead to Hardy-Weinberg equilibrium D. Genetic drift changes the existing gene or allelic frequency in future generations.

    Assertion: Natality rate increases both population size and population density. Reason: Natality increases the number of individuals in an area by births.

    A population in which number of pre-reproductive individuals is very large, number of reproductive individuals is moderate while post-reproductive individuals are fewer. Which kind of age pyramid is represented by such a population ?

    Following table summarises the differences between natality and mortality. Select the incorrect ones. {:("Natality","Mortality"),((i)"Natality is number of births per unit population per unit time.","It is number of deaths per unit population per unit time."),((ii)"It adds new individuals to the population.","It removes individuals from the population"),((iii)"It increase the size of population.","It decreases the size of population"),((iv)"It increase population density.","It reduces population density."),((v)"It is low when population size is small and high when population size is large.","It is high when population size is small and low when population size is large."):}

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