In 1998,researchers Found That Genes Similar to the Drosophila Gene

Multiple Choice

In 1998,researchers found that genes similar to the Drosophila gene tinman are necessary for heart development in vertebrates.What can you conclude about the ancient bilaterian ancestor of insects and vertebrates over 500 million years ago?

A) The fly species that eventually gave rise to vertebrates used tinman to make a heart.
B) Something about heart development requires a gene to have a tinman-like sequence,but the vertebrate and invertebrate genes arose by convergent evolution -- so the ancestor had a similar but not homologous gene.
C) The ancient ancestor lacked a heart,but already had a tinman-like gene.
D) The ancestor had a heart-like structure that was specified by a tinman-like gene.