Which of the following best describes the G1 phase? A copy of the DNA is made as the cell prepares to divide.
The cell grows and checks the duplicated chromosomes for errors.
The cell grows and all cellular contents, except the chromosomes, are
duplicated
The nuclear membrane breaks down so that the chromosomes are free to
move about the cell.
(11
Prostou

The punnett square is the device used to predict genetics.

The answer would be c, white eyes are homozygous recessive. in the early 1900s, morgan conducted several experiments with vinegar  flies (drosophila). one  sample revealed an anomaly: a  white-eyed, single male fly. he attempted to breed this fly with the typical red-eyed females. the offspring were all red-eyed. using flies from this new generation (brother-sister pairs)  produced some red-eyed and a few white-eyed flies. the white-eyed were all male. in later experiments, he was able to produce white-eyed females. this proved that white eyes are not lethal to either sex (ruling out a and b). since the percentage of white eyes to red eyes is so low, white eyes are not a dominant trait. it would be a recessive trait. 

What have scientists learned about plant behavior by studying the dodder plant