1) they have similar chemical properties.
for example fluorine from the 17th column is a non metal so does all the elements of that group.
2)they have same valence electrons in their outermost shell
example
electronic configuration of
hydrogen 1, lithium 2,1, sodium 2,8,1 and so on.
3) have same valency.
There are three domains:
the ARCHAEA, BACTERIA, and EUCARYA
oragnisms from ARCHAEA and BACTERIA have a prokaryotic cell structure, whereas organisms from the domain EUCARYA encompass cells wirh a nucleus confining the genetic material from the CYTOPLASM.
and all of this is the answer..good luck
Cross: Ib Ib × Ia Ib
Offspring: IaIb , IbIb, IaIb, IbIb
ab = 50%
b = 50%
a = 0%
In short, Your Answer would be Option A) 0%
Hope this helps!