I've had a couple twins, and theres always been the dominant one of the 2....which is the only one that ever makes it. I have always wondered about the M/F twin subject so thanks for sharing.
This was my most recent experience with twins. Only one tap root popped when I germinated it in paper towel. Some days after the big one was transplanted to hydroton, the little one just popped up out of nowhere.
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I pulled the little one meaning to just rip it out but it all came out as one long tap root.
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With its willingness to stay in one piece, I figured I'd give it another shot in its own pot.
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Thats when it decided it was no longer happy and it got culled. -I tried lol