Basically humans and birds diverged (last shared a common ancestor) around 300 million years ago. Thats when we shared the same DNA over that time evolution has altered our genomes so now around 60% of chicken genes are similar to human genes:
If a single gene was very similar between a chicken and a human it may be able to be swapped. If it wasn’t it would probably wouldn’t have the same effect within the organism and the outcome would be hard to predict, but probably not be be beneficial. Genes in a genome as well as regulatory elements have co-evolved in a genome over millions of years so inserting a new gene that hasn’t been part of that process would probably mean the genetic machinery driving expression etc. wouldnt work or if it did may do soemthing entirely different than was intended.
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