Q1. A lightly anesthetized patient is still capable of spontaneously breathing and is artificially ventilated at his normal tidal volume, but twice his normal frequency, with a gas mixture of 50 percent O2 and 50 percent N2 for 10 minutes. On cessation of this artificial ventilation, patient fails to breathe for 1 minute. The most significant probable cause of this temporary apnea is decreased activity of the what?

Q2. The possibility that a baby would be a boy is ½ as is the probability that a baby will be a girl. Elucidate this fact by explaining the mechanism of meiosis in the production of gametes and the process of fertilization. If a family has 4 boys and 3 girls, what is the probability that the next child would be a girl?