4 ms·
This is because there's four bases and each can either be included or excluded from a given combination. So there are 4*2 = 16 combinations each of which with t
by benjamin-lee 5y ago
This is because there's four bases and each can either be included or excluded from a given combination. So there are 4*2 = 16 combinations each of which with their own letter. In all honesty, these are pretty rarely used in practice these days except for N (any base) although they do sometimes show up when representing consensus sequences.
- pdimitar 5y agoWhat do you mean that each base can be included or excluded? Isn't only one extra value needed? Sort of like nil?
- ac29 5y agoBecause there are notations for any combination of bases. There's a way to indicate "C or G", "A or T", "C, G, or A", etc.
- pdimitar 5y agoOh. So what's the grand total of all possible permutations of single and multiple (connected with an "or") values? I'll also read through your links, thanks for posting them.