The right matches are :
Bottleneck effect is matched with Disease wipes out almost 90% of a population...
Gene flow is matched with Population of rats travels...
Founder effect is matched with Biologists introduce a small population...
Mutation is matched with Change in a DNA sequence...
The mutation is simply defined by a change in the nucleotide sequence of the DNA of a species.
The founder effect is genetic variation that occurs when a new population is established.
The bottleneck effect is a major decrease in a population of species due to a spontaneous or provoked phenomenon.
gene flow is an addition of a new allelic lot in a population (introduction of individuals into a population of which they were not originally a part).