4. what is used to make a linkage map for a group of organisms?
a the number of different genes found in the group
o b the number of phenotypes a gene set can produce in the group
c the number of traits one gene set can control in the group
d the number of times linked genes are separated in the group

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.

answer///multiple alleles;

can you make it bigger i can't see it