Given that there are 30 people, then there are 60 alleles. 10 of these people are not tasters. So, there are 20 of those 60 are t alleles. So, 40 alleles are left, but of a mix of t and T. It said in the lesson text that people who can taste this have at least one dominant gene "T". So it could either be homozygous (T,T) or heterozygous (T,t or t,T). People with homozygous recessive genes (t,t) can't taste it.
As you travel from the North Pole toward the equator, you would expect to see tundra; grasslands; tropical rain forest. The correct option among all the options that are given in the question is the first option or option "a". I hope that this is the answer you were looking for and it has come to your help.
