The mechanism responsible for the changes in fish size between generation 1 and generation 100 is the gene flow mechanism.
Individuals may migrate from one group or region to another as part of another evolutionary mechanism. Interbreeding between the migrant individuals and the new population adds their genes to the local population's gene pool. The population's gene flow is established as a result.
For instance, when wind takes seeds far outside the range of the parent plant population, gene flow occurs. Another illustration might be when animals leave a herd. They are compelled to migrate as a result, adding new genes to the gene pool. Because gene flow makes gene pools more similar to one another, it tends to increase the similarity between remaining populations of the same species.
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Answer:
The mechanism responsible for the changes in fish size between generation 1 and generation 100 are mutation, genetic drift, and gene flow.
Explanation:
What is mutation?
An alteration in the nucleic acid sequence of an organism's, virus's, or extrachromosomal DNA is referred to as a mutation. DNA or RNA can be found in the viral genome.
Genetic drift.
Genetic drift is the arbitrary change in the frequency of a gene variant in a population. Gene variations may totally vanish due to genetic drift, which would limit genetic diversity.
Gene flow.
Gene flow is the exchange of genetic information between populations. Two populations can be regarded as a single effective population if the rate of gene flow is high enough for them to have similar allele frequencies.
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