Two alleles/letters for one trait that are the same (ex: dd or dd)

How did the research presented in the article affect scientists' understanding of the evolution of eukaryotes

Protein and polypeptide sequences can be determined by first partially hydrolyzing the protein or polypeptide followed by amino acid sequencing of the fragment pieces using the chemical degradation process known as edman degradation. determine the sequence of the initial (18-amino acid) polypeptide that produces the following five partial sequences after hydrolysis and edman degradation.

Agland that serves both the digestive and the endocrine systems is called