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It is well known that land vertebrates' limbs evolved from fins, and in cetaceans they became fins (flippers) again. But what about dorsal fins? Is their fetal development in whales and dolphins controlled by the same genes as in fish? Meaning, when they evolved, did long dormant genes reactivate, or is it a completely new development? If it's not known on a genetical level, are they similar structures anatomically or are there fundamental differences? User38453838 ( talk) 07:21, 7 February 2020 (UTC)
Science desk | ||
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< February 6 | << Jan | February | Mar >> | February 8 > |
Welcome to the Wikipedia Science Reference Desk Archives |
---|
The page you are currently viewing is a transcluded archive page. While you can leave answers for any questions shown below, please ask new questions on one of the current reference desk pages. |
It is well known that land vertebrates' limbs evolved from fins, and in cetaceans they became fins (flippers) again. But what about dorsal fins? Is their fetal development in whales and dolphins controlled by the same genes as in fish? Meaning, when they evolved, did long dormant genes reactivate, or is it a completely new development? If it's not known on a genetical level, are they similar structures anatomically or are there fundamental differences? User38453838 ( talk) 07:21, 7 February 2020 (UTC)