In genetic drift,the allele frequencies in a gene pool change because of chance. Genetic drift is the variation of the allele and relative frequencies of different genotypes in a very small community or population, and focusing on the particular genes which did not produce or just happened to be gone.
<span>Ethics are human's comfort and interest,it cannot protect the environment so it causes damages to the environment where people will be affected.Nowadays Ethics are implemented to meet the needs of the current generation but it will be dangerous to the future generation.So that environmental crisis demand a new ethics which want focus on economic and social development,protective and caring environment.</span>
Several different mutations can cause the same genetic disease when we consider that t<span>he actual position of the mutation in the gene may vary but still result in a defective gene. For example, there are many mutations that can lead to cystic fibrosis. We can count up to more than one thousand different mutations that can lead to the same sickness. If chromosomes are affected while they are developing you can expect genetic diseases. </span>
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