1. If the ability to taste PTC were controlled by only two alleles: one dominant (T) and one recessive (t), would there be any way to distinguish between the heterozygous (Tt) individuals and the homozygous dominant (TT) individuals without mating or performing DNA analysis? Explain your answer.

No

Explanation: there would not be a way to distinguish between Tt and TT without mating or DNA analysis because T is dominant in Tt, therefore has the same physical characteristics as TT.

he forelimbs below belong to four species that descended in a direct line from the ancestral mammal shown above. of the four descendants shown, which species most likely appeared earliest in evolutionary history?

imagine a line passing through the center of earth that goes through both the north pole and the south pole. this imaginary line is called an axis. earth spins around its axis, just as a top spins around its spindle. this spinning movement is called earth's rotation. at the same time that the earth spins on its axis, it also orbits, or revolves around the sun. this movement is called revolution.