Why do the same trans-regulatory elements lead to very different morphology in different species of organisms?
A. Different species have genetic codes that use different codons, leading to different amino acid sequences.
B. Morphological change depends on sequence mutations in enhancers.
C. These regulatory elements have no effect on morphology, only metabolism.
D. The transcription factor activates different combinations of enhancers and downstream genes.
E. The trans-regulatory elements in different lineages have independently evolved the same sequence, by convergent evolution.
Answer: D. The transcription factor activates different combinations of enhancers and downstream genes.
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