Erwin Chargaff found that
ratios of adenine and cytosine and thymine and guanine are constant.
ratios of adenine and thymine and guanine and cytosine are constant.
ratios of adenine and guanine and thymine and cytosine are greater than one.
ratios of adenine and guanine and thymine and uracil are constant.
Erwin Chargaff that for a double stranded DNA, the ratios between adenine and thymine and guanine and cytosine are constant.