In addition to the appearance of the antifreeze gene, icefish have also been found to have DNA sequences similar to the
DNA sequences in hemoglobin genes of other fish species,
However, these DNA sequences are not complete and therefore
not functional in icelish. This evidence makes it likely that
KO
A. icelish ancestors
had hemoglobin
B. icefish will soon
produce offspring
with hemoglobin
C. hemoglobin is a
molecule made by
some fish that do
not have genes for it
D. Soon all fish will
stop producing
hemoglobin