I planted black krim tomato seeds and one of them came out like this:
Other black krim plants are very different. This has rounded leaves, long branches and is somehow milky green color. Does anyone know what it could be? Thank you!
I'm afraid with over 20k tomato breeds and striking similarities among many of them (with crosses possible), there's not enough information for others to know what kind of tomato this is. Even if it had fruit that looked just like a particular breed's fruit, it would be a guess at best.
If the seeds were all supposed to be from Black Krim, then it's possible that one of them (or else all the others) were cross-pollinated, or that both groups were crossed by different tomatoes. It's also possible that it's a mutant.
It's also possibly a stray seed from another kind of tomato, which may have been mixed up with the Black Krim seeds.
I think it has no variety/breed.
It looks very similar to "normal tomatoes". I think the seeds originated from cross pollination from other varieties. So it is an hybrid, but not stabilized. So we cannot classify at any variety.
"Normal tomatoes": such hybrids tend to have more the dominant genes, so they tend to look like normal tomatoes (smaller fruits). You may get a new variety, but it is not probable.
I have many of such "normal tomatoes": I but different varieties, but bees will cross-pollinate the varieties. Next year many plants will grow up (and I keep on a corner of my garden). It is incredible how "common" they will become. Parents are not recognizable.