Q1. Describe about how various kinds of systematic variations in the Earth's orbit about the sun are thought to be the best explanation for periodic ice ages on the Earth.
Q2. F1 progeny consisted of 1/2 minute and 1/2 minute wild-type flies. When F1 Minute progeny wer crossed with each other, the F2 consisted of 2/3 minute and 1/3 wild-type flies. Describe these results and give the genotype of the P, F1, and F2 flies.