In a bacterial cross in which the donor (Hfr)is a^+b+ and the recipient strain (F^-)is a^+b+,it is expected that recombinant bacteria will all be a^+b+.

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In a bacterium cross between Hfr and F- strains, the recombinant bacteria will receive genetic material from the Hfr strain and then undergo recombination, resulting in a mix of traits from both the Hfr and F- strains. Therefore, the expected recombinant bacteria in this cross will not be identical to the Hfr strain and will likely have a different combination of traits, including the possible loss of the b allele.

In a Bacterial Cross in Which the Donor (Hfr)is A+b+

In a Bacterial Cross in Which the Donor (Hfr)is A^+b+