London, England is at (Greenwich Mean Time) GMT. Perth, Australia is (Greenwich Mean Time) GMT +8 hours, ie. 8 hours ahead of Greenwich, England. Perth is 8 hours ahead oâ¦f London. During the Northern Hemisphere summer, London, England is at (British Summer Time) BST. Perth Australia is (British Summer Time) BST +7 hours. Perth is 7 hours ahead of London during the Northern Hemisphere summer.
Answered by The WikiAnswersÂ® Community. Making the world better, one answer at a time. A change in the nucleotide sequence of DNA is called a mutation. A change in the nucleotide sequence of DNA is called a <b>mutation</b>.
Epigenetics literally means above or on top of genetics. It refers to external modifications to DNA that turn genes on or off.. These modifications do not change the DNA sequence, but instead, they affect how cells read genes. Examples of epigenetics.Epigenetic changes alter the physical structure of DNA.One example of an epigenetic change is DNA methylation â the addition of a methyl group, or a chemical cap, to part of the DNA molecule, which prevents certain genes from being expressed. Another example is histone modification.Histones are proteins that DNA wraps around.ne example of an epigenetic change is DNA methylation â the addition of a methyl group, or a chemical cap, to part of the DNA molecule, which prevents certain genes from being expressed. Another example is histone modification.