What is the function of the protein keratin

Keratin serves important structural and protective functions, particularly in the epithelium. Some keratins have also been found to regulate key cellular activities, such as cell growth and protein synthesis

an organism's phenotype is the  form of a trait  that it  displays. for  flowercolor, a pea  plant  can  display  a phenotype of purple or white flowers. an organism's  genotype  is the alleles of a gene it contains. based on his data, mendel concluded that a phenotype can be  determined  by more than one  genotype.