Learn English – What does “the future may hold…” mean in this context

meaning-in-contextsentence-meaning

In meiotic chromosomal interactions, the danger is that negative
interactions may be passed on to future generations. The mutations
result in a variety of well-known conditions. The future may hold more
or fewer, and it is anybody's guess.

A. Epistasis
B. Multiple
alleles… etc.

What does the bold sentence mean in this context? I have found the meaning of one part of a sentence only: https://www.google.com.ua/search?client=opera&hs=pEi&q=it+is+anybody%27s+guess&oq=it+is+anybody%27s+guess&gs_l=psy-ab.3..0i22i30k1l4.16718.16718.0.17851.1.1.0.0.0.0.98.98.1.1.0….0…1.1.64.psy-ab..0.1.96.gEzotNrmox4
Does it mean that diseases that are passed on may be more or less serious and it is difficult to determine whether they will be inherited or not?

Best Answer

The sentence means that, in the future, there may be more or less mutations than at present and that there is no way to know which will happen.

"It is anybody's guess" is a way of saying "we have no clue".