00:01
Okay, so the question is asking us, a typical prokaryotic cell has about 3 ,000 genes in its dna, while a human cell has almost 21 ,000 genes.
00:09
About 1 ,000 of these genes are present in both types of cells.
00:13
Based on your understanding of evolution, explain how such different organisms could have the same subset of 1 ,000 genes.
00:18
It's also asking what sorts of functions might these share genes have.
00:23
Now, the reason that such different organisms have the same subset of 1 ,000 genes, because they share a common ancestor.
00:32
Even though they're very different and they've gone on their own paths, if you go back far enough on the tree of life, you will find a common ancestor of all life on earth.
00:41
And it is through this common ancestor that all these organisms have inherited these 1 ,000 genes.
00:48
Now, the next question, what sorts of functions might these shared genes have? these functions would be very fundamental and primitive functions that have not been lost through the eons of time.
01:02
Functions such as dna replication, dna synthesis, protein synthesis, ribosome production, traits that all cells have and the dna decode for all these functions that are possessed in all cells on earth...