Question

what was thomas hunt morgans main contribution to science? he discovered that certain traits were linked to the x chromosome. he was the first to use fruit flies in research. he created the first white - eyed female drosophila. he created the first white - eyed male drosophila.

Explanation:

Thomas Hunt Morgan conducted experiments with fruit flies. He discovered that certain traits (like eye - color in fruit flies) were linked to the X chromosome. This was a significant contribution as it provided evidence for the chromosomal theory of inheritance. Using fruit flies in research was not his unique contribution as others might have used them before. Creating a particular type of fruit fly (white - eyed male or female) is more of an experimental result rather than a major scientific contribution compared to the discovery of X - linked traits.

Answer:

He discovered that certain traits were linked to the X chromosome.