I am not completely sure about this one, but I found on the Internet that what is a condition required for the Hardy-Weinberg principle to be in effect is A) random mating occurs.
Answer:
A., Vision. Eyes contain two types of photoreceptors called rods and cones.
C.) viruses need a living host to reproduce... this is cause by viruses being Dioxyriboneuclicacid(DNA) surrounded by a protien shell so viruses are not alive per say.... but they get into cells and use living cells to reproduce
Definition. The hypothesis accepted to be true if the null hypothesis is rejected based on statistical evidence. Supplement. In the statistical testing of hypothesis, the two rival hypotheses are the null hypothesis and the alternative hypothesis.