There are three different alleles for the gene that determines blood type: A, B, and 0. This type of inheritance pattern is an example of:

option a is correct i.e.

explanation:

in context to the membrane of nerve impulse, the outer membrane of neuron is semi permeable that is only sodium ions can pass through the membrane i.e. smaller ions can pass through the membrane while larger ions cannot pass through it.

a lot of people sadly don't know the best way to learn is cheating off of your friends or this amazing thing called google