Question

The gene frequency of a population changes
A. In one particular environment
B. When the population decreases
C. When the population lives in different conditions
D. When population reproduces asexually

Answer 1

Hint: Genetic diversity of a population decides the fate of that population. If a population is scattered diversely and not to a limited environment, it will survive better than the rest of the species and vice versa.

Complete answer:
‘Gene Frequency’ (also called allele frequency) means the frequency or the proportion, of different kinds of allele available of a single gene in a population.
Every other individual is different from each other because of the variety of genes that we inherit from our parents.
The variety of genes or genetic diversity stands a really important role in natural selection.
Natural Selection was the process, first explained by ‘Darwin’.
In natural selection, a particular species inherits some changes in its gene so as to survive the changes in the environment. Species which do not evolve so as to adapt to their current environment, would be eliminated from nature, hence the name- ‘Natural Selection’.
Each type of environment possesses different conditions and requires different traits in an individual to survive i.e. a trait that might help an individual to survive in one environment, won’t necessarily help it to survive in other environments too.
For example- if there are grey bugs and brown bugs living on a tree, the birds eating them will capture the grey bugs, as they are easily visible to the birds. As a result, soon the population of grey bugs will become less than brown ones and after some time, those grey bugs won’t be seen on the tree, anymore.
Let’s take humans, for example, we can see many differences among us. For example- some of us are tall, some short, some can eat endlessly and still look slim while others are not able to lose their weight. Where do these differences come from? These differences are a mixed result of genes that we inherit from our parents, mutations that might occur in our genes and the environment we grow in and controlled by many other factors.
Hence, the more different conditions a population lives in, the more gene frequency we are going to observe in that population.
So, the correct answer is “Option C”.

Note:
Gene frequency of a population can be affected by many factors, for example- mutation (although, the amount of change is too less to be noticeable), migration (introduction of new genes due to invasion of new individuals in the environment), genetic drift, natural selection, random mating, inbreeding, etc.