how many replicated chromosomes does the cell have after chromosome replication?
'A' and 'a' are still 2 different chromosomes, though they are homologous to each other (code for the same genes). When DNA is replicated, you now have 2 copies of the 'A' chromosome (or 2 'A' chromatids) and 2 copies of the 'a' chromosome (2 'a' chromatids), 2 'B' and 2 'b', and so on.