Because DNA is just made up of Adenine, Guanine, Cytosine and Thymine. Adenine binds to Thymine and Guanine binds to cytosine. This is basic for all the organisms living on the earth. Whatever species we isolate and check their nucleic acid compounds it is made up of above four compounds. So, In the lab you can put fish genes into mice, you can put human genes into bacteria, you can put bacteria genes into yeast. Due to basic components same it is accept by all species.
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