LIFE SCIENCE

OBJECTIVE LIFE SCIENCE

EVOLUTION

Please wait while the activity loads.
If this activity does not load, try refreshing your browser. Also, this page requires javascript. Please visit using a browser with javascript enabled.

If loading fails, click here to try again

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

Which of the following conditions are necessary for natural selection to occur?

A	overproduction of offspring
B	variation within a population
C	variation of fitness among the population
D	all of the above

Explanation:

Detailed explanation-1: -The essence of Darwin’s theory is that natural selection will occur if three conditions are met. These conditions, highlighted in bold above, are a struggle for existence, variation and inheritance. These are said to be the necessary and sufficient conditions for natural selection to occur.

Detailed explanation-2: -More organisms are born than can survive. Organisms vary in their characteristics, even within a species. Variation is inherited. Differences in reproduction and survival are due to variation among organisms.

Detailed explanation-3: -Lack of necessary genetic variation. Selection can only operate on the available genetic variation. Constraints due to history. Trade-offs.

There is 1 question to complete.