You find a way to attach either a red or green fluorescent dye to nucleotides. Double-stranded DNA molecules with both strands labeled red fluoresce red, those with both strands labeled green fluoresce green, and those with one strand labeled red and the other green fluoresce yellow. You grow human cells in the presence of "red" nucleotides until both DNA strands of all chromosomes fluoresce red. You then allow one round of DNA replication in the presence of "green" nucleotides Continuing your experiment with "red" and "green" labeled chromosomes, you allow cells with DNA labeled "red" in both DNA strands to undergo two rounds of DNA replication in the presence of "green" nucleotides. What pattern of fluorescence would you expect to see in the sister chromatids of each chromosome?
