English subtitles

← Total Genome

Get Embed Code
1 Language

Showing Revision 1 created 09/27/2013 by Cogi-Admin.

  1. The answer to this question is 25, unique chromosomes
  2. in the total cellular genome. What I wanted you to
  3. do was look at our nuclear mitochondrial chromosomes, take the
  4. first pair, we don't want the extra copy, right, there
  5. are two copies in this pair. We just going to
  6. count that one as a unique chromosome. It's unique. It's
  7. different from all the other chromosomes. And the same thing
  8. for the second pair. We're not going to count the copy,
  9. this is two. Third, three. Four, all the way till we get to 20, 21, 22.
  10. And our last pair, the 23rd pair, though.
  11. We're going to count each chromosome by itself, because
  12. they're not the same. The X and Y
  13. are different. So, chromosome, there's a 23rd unique one
  14. and a 24th unique one. And then, if
  15. we include the mitochondrial chromosome, that's 25 unique chromosomes.
  16. Remember, you have one extra copy of every
  17. other autosome in your genome at any given
  18. time in the cell and there are many
  19. mitochonria and thus many mitochondrial chromosomes in a
  20. cell at any given moment. But when we
  21. talk about the total cellular genome, how many
  22. unique chromosomes there are There are a total
  23. of 25 when we leave out the extra copies.