Introduction Natural selection, which was a theory regarding biological evolution proposed by Charles Darwin in 1859 in the book On the Origin of Species. He described natural selection as the process of only the organisms that can best adapt to environment can survive and get the best resource and pass their genetic information to the next generation. Some species will pass some traits which can help them to survive and reproduce to their offspring, which will become very common eventually. (khan ). There are four processes in natural selection. The first one is variation, the difference in terms of behaviours and appearance of each species, which can be hereited. The next step is competition between species in order to seize the best …show more content…
Over generations, natural selection will decrease genetic composition because those weaker genes will be lost during evolution and only the strong ones will survive. And they tend to have long term effect due to the time specieses take to adapt to environment and filter the good traits to inherit. On the other hand, genetic drift can either increase or decrease without a favor side because they are only influenced by chance. The effect it brings are in short term since they are only caused …show more content…
The first one was done randomly by tossing a coin to determine their offspring's genotype. The shaded pairs were only breed with other shade pairs, and only produce male offsprings to next generation; non-shaded pairs were only breed with non- shaded pairs, and only produce female offsprings to next generation. When a coin was flipped, the outcome (H or T) would determine which allele would be inherited from mother or father. Each generation’s genotypes came from the last generation, for instance, the F1 genotypes came from founding population; and the F2 genotypes came from F1. There were 3 blocks and 8 generations in total, representing 3 couples and their