In squirrels, the gene for gray fur (G) is dominant over the gene for black fur (g). If 50% of a large litter of squirrels are gray, the parental cross that produced this litter was most likely

Gg and gg will most likely be the parental cross.

This is because G is dominant over g, meaning that the cross of G dominating g will happen one in two of every offspring, in other words, meaning that 50% of the offspring will have grey fur.

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.

the answer would be..

b. sucking