I've heard about this thing called the ubiquitous gene that is proof that we share a common ancestor somewhere. coulden't find it on wikipedia353535355353535
Yes. Technically it's called a ubiquitous protein, I made a mistake earlier when I was referring to them. It's not major though since your genes are what determine the proteins that get produced.
Anyway, the structure of a protein determines its function. It's kind of like a pair of scissors. The function of a pair of scissors to cut things is determined by its structure of two blades hinged together at a pivot point.
To kind of make this short, Cytochrome C is one of these ubiquitous proteins that are found in all living organisms. There are over 10^93 different amino acid (the basic unit of a protein) sequences that make up this protein. So, there is no reason other than heredity that two organisms should share the same amino acid sequence. After all, the number 10^93 is greater than the number of atoms in the entire universe. However, when we compare our genome with the genome of a chimpanzee, we find that the sequence is exactly the same. When we compare our genome to that of other mammals, the most we find is only about 10 amino acids different. This is expected since we split from other mammals much further back in the past.
If you want more details, read this.
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