Question

Which of the following led Thomas Hunt Morgan to conclude that crossing over occurs?

Genes on the same chromosome are sometimes inherited separately.

Dominant linked genes often express codominance.

Genes on the same chromosome are linked and inherited together.

All of the above are correct.

Answer 1

Genes on the same chromosome are sometimes inherited separately.

Answer 2

The answer is Genes on the same chromosome are sometimes inherited disparately.  I had the exact same question and that was the answer hope this helped! Have a good day!