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Lettris is a curious tetris-clone game where all the bricks have the same square shape but different content. Each square carries a letter. To make squares disappear and save space for other squares you have to assemble English words (left, right, up, down) from the falling squares.
Boggle gives you 3 minutes to find as many words (3 letters or more) as you can in a grid of 16 letters. You can also try the grid of 16 letters. Letters must be adjacent and longer words score better. See if you can get into the grid Hall of Fame !
Change the target language to find translations.
Tips: browse the semantic fields (see From ideas to words) in two languages to learn more.
|This article does not cite any references or sources. (December 2009)|
For example, some mutations in a DNA triplet or codon do not change which amino acid is introduced: this is known as a synonymous substitution. Unless the mutation also has a regulatory effect, synonymous substitutions are usually neutral. Some non-synonymous mutations, i.e. mutations that do change the amino acid, are also neutral: these neutral changes are often to a chemically similar amino acid that works just as well. Such mutations may spread through neutral drift.
Neutral mutations can accumulate over time due to genetic drift or genetic draft. According to the neutral theory of molecular evolution, while the majority of mutations are deleterious, the majority of mutations that go on to become fixed as differences between species are neutral.
Many or even most mutations to noncoding DNA are neutral.
|This genetics article is a stub. You can help Wikipedia by expanding it.|