This is going to be controversial.
The Thylacine/Tasmanian tiger is being planned to be brought back from the dead. Multiple relatively recently extinct animals could follow. Endangered animals (Black footed ferret) are already being cloned to enhance genetic diversity and give their species a better chance for survival.
www.bbc.com
On a sort of unrelated note, apparently white tigers derive their skin pigment via a single gene alteration as discovered in 2013.
www.bbc.com
If that's the case, why can't we use CRISPR to create white Bengal tigers and spare all the existing white tigers further inbreeding? I don't understand why no one is working on this. It may be unethical, but it does a lot of good by removing future tiger suffering due to inbreeding and improves their genetic diversity by (finally) letting the white tigers breed with others they aren't closely related to. Basically, zoos can acquire white tigers without resorting to inbreeding which many still do. Nor does it harm the tigers (who we've made white) as they are (theoretically) perfectly healthy and can still reproduce as normal.
In the context of Planet Zoo, perhaps a future gene editing CRISPR DLC can introduce recently extinct animals and allow us to create white Bengal tigers artificially.
The Thylacine/Tasmanian tiger is being planned to be brought back from the dead. Multiple relatively recently extinct animals could follow. Endangered animals (Black footed ferret) are already being cloned to enhance genetic diversity and give their species a better chance for survival.

How extinct animals could be brought back from the dead
From an Australian frog that swallowed its own eggs to woolly mammoths, scientists could soon bring back long-lost species from the dead.

On a sort of unrelated note, apparently white tigers derive their skin pigment via a single gene alteration as discovered in 2013.

White tiger's coat down to one change in a gene
Chinese scientists trace the rare white colouration in Bengal tigers to a single change in a gene that affects a host of animals, including humans.

In the context of Planet Zoo, perhaps a future gene editing CRISPR DLC can introduce recently extinct animals and allow us to create white Bengal tigers artificially.
Last edited: