What do the results tell us about the experiment? The bacteria from all 3 farms were almost 100% alive in the control samples, meaning that
A
the experiment did not work.
B None of the bacteria from the 3 farms survived in the control samples.
с
Because the bacteria in the control were almost 100% alive, we know that any deaths of
bacteria in the other samples was because of the antibiotics.

During crossing-over, a. genetic material is exchanged between nonsister chromatids, resulting in new combinations of alleles. b. nonsister chromatids from each homologous chromosome of a tetrad are exchanged, resulting in new combinations of alleles. c. one homologous chromosome of a tetrad is exchanged with another tetrad, resulting in new combinations of alleles. d. sister chromatids from each homologous chromosome of a tetrad are exchanged, resulting in new combinations of alleles. e. genetic material is exchanged between sister chromatids, resulting in new combinations of alleles.