Artstudio pro symmetry rulers12/8/2023 ![]() ![]() Symmetry under rotations is also very prevalent in nature. These "mirror" copiesīoth provide backups in the case of bad mutations, and allow the chromosome, in some sense, to have sex with itself - strands can swap position.įor figures and shapes drawn on a flat piece of paper, there are precisely four types of "rigid" symmetries (when stretching and distortions are not allowed), known as: reflection, rotation, translation, and glide reflection.įigure 4: A snow flake is symmetric under rotation About 6 million (out of 50 million) of the Y's DNA letters form palindromic sequences. To their surprise, however, the researchers that completed the Y's genome sequencing discovered that these chromosomes fight destruction with palindromes. Until 2003, genome biologists believed that due to the fact that the Y lacksĪ partner (with which it could swap genes), the genetic cargo of this chromosome was about to dwindle away through damaging mutations. Phrases with this type of symmetry are known as palindromes, and palindromes play an important role in the structure of the male-defining Y chromosome. Known NOVA documentary: A Man, a Plan, a Canal, Panama, has the same property. That is, the sentence remains the same when read backwards. This phrase is symmetric with respect to back-to-front reading, letter by letter. Consider for instance the phrase "Madam, I'm Adam". Symmetry represents immunity to possible changes - those stubborn cores of shapes, phrases, laws, or mathematical expressions that remain unchanged under certain transformations. ![]() When things that could have changed, don't
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