I'm prepping an activity for my biology students on cystic fibrosis. There are about 2000 different mutations of the CFTR gene that cause CF. Since the final phenotype is pretty much the same, can I still claim that all these mutations represent different alleles?
I like to point out that genes tend to have more than two alleles - it's something that students really struggle with. But if every allele needs to have a different phenotype based on the standard definition, then this isn't ideal.
Thanks for the help.