0:00:01.470,0:00:03.060 So if we think about our nuclear 0:00:03.060,0:00:07.770 chromosomes, and our mitochondrial chromosomes, that includes everything 0:00:07.770,0:00:14.370 that you see here in this picture. All of this is the total cellular genome, for 0:00:14.370,0:00:18.410 the total human genome. Now when I say the total human genome in this case, I'm 0:00:18.410,0:00:22.600 not referring to any individual human in particular. 0:00:22.600,0:00:26.790 I'm just referencing The constituent parts, or chromosomes, 0:00:26.790,0:00:28.590 that all play a role in making a 0:00:28.590,0:00:33.060 human. For example, we know that chromosome one, two, 0:00:33.060,0:00:35.270 three, four, five, six, seven, alright, all the way 0:00:35.270,0:00:38.160 down to the chromosome 22 and the sex chromosomes 0:00:38.160,0:00:42.650 and the mitochondrial chromosome is important in making a 0:00:42.650,0:00:46.470 human. Now for just a moment, don't count extra 0:00:46.470,0:00:48.970 copies of chromosomes. I want you to tell me 0:00:48.970,0:00:52.230 how many unique chromosomes are there in the total 0:00:52.230,0:00:57.590 cellular genome. Remember, I don't want you to count extra copies of 0:00:57.590,0:01:02.510 chromosomes. I want you to tell me how many unique chromosomes are there? It can 0:01:02.510,0:01:05.820 be a little tricky, so think about it before you answer. And I 0:01:05.820,0:01:09.530 want you to put your answer in number form in this text box here.