The presence of deleterious alleles in a heterozygous genotype in a population is called......

Select the appropriate option for the founder effect.

What is the reason that some bacteria can grow in a medium containing streptomycin?

Given below are two statements.
Statement $I$ - In disruptive natural selection,individuals acquire peripheral character value at both the ends of the distribution curve.
Statement $II$ - Industrial melanism is an example of disruptive selection.
In the light of the above statements,select the correct option given below:

Which of the following natural processes is likely to hasten organic evolution?

Who coined the phrase 'Survival of the Fittest'?