Suppose 64% of a remote mountain village can taste phenylthiocarbamide (ptc) and must, therefore, have at least one copy of the dominant ptc taster allele. if this population conforms to hardy-weinberg equilibrium for this gene, what percentage of the population must be heterozygous for this trait?

The answer is; 48%

This is how to calculate;

Let's assign the dominant allele letter ‘T’ and the recessive letter ‘t’

Using the hardy weignburg equation; p2 + 2pq + q2  = 1

P2 + 2pq = 0.64

q2 = 1 – 0.64 = 0.36

q = 0.6

Remember that; p + q = 1

P = 1 – 0.6 = 0.4

Now to calculate population with herozygour trait = 2pq

2 * 0.4 * 0.6 = 0.48

This means 48% of the population is heterozygous for the trait that enable tasting of phenylthiocarbamide

The correct answer is It converts light energy to chemical energy. That is because creation of oxygen is not done for us, the plants don't really care. The oxygen created is a side addition to the fact that plants create energy for themselves. They take light energy and convert it into energy for themselves made out of chemicals, oxygen being their waste that we use.