Science Assessment

Assume that some type of forelimb was present in the common ancestor of birds, crocodiles, whales, and pigs, and that the ancient forelimb evolved into the legs, wings, and fins of animals that exist today. What would be true about the genes that code for forelimbs in theses different animals that evolved from the forelimbs of the common ancestor?

1. Completely different sets of genes would code for forelimbs in these different animals.
2. Many of the same genes would code for arms in crocodiles and pigs but these genes would be completely different than the genes that code for wings in birds or fins in whales
3. Many of the same genes would code for forelimbs in all of these animals.
4. There is no relationship between the traits of organisms and which genes for forelimbs the organisms have.