When an allele is not expressed in heterozygotes, but is expressed in homozygotes, it is said to be: ?

A recessive allele, not expressing its gene so to speak, when in heterozygotes its overcome by a dominant allele. but in homo it is only combined with the same recessive allele.

Ibelieve the answer is relative humidity  because it makes more sense that way. solar flares usually occur in space it doesn't affect the earth, well it could but it wont make a significant damage.  latitude is land it doesnt do anything. prevailing winds, i dont know the correct meaning for this but i doubt that affects the land so it has to be relative humidity.

Your answer is going to be a. i know my biology