ở ruồi giấm gen a quy định cánh dài trội hoàn toàn so với gen a quy định cánh ngắn cho ruồi giấm cánh dài và cánh ngắn giao phối với nhau f1 tỉ lệ 50% ruồi cánh dài 50% ruồi cánh ngắn tiếp tục cho f1 giao phối với nhau thì f2 thống kê ở cả quần thể có tỉ lệ 9 cánh dài 7 cánh ngắn

Amutagen is 1: a living thing that has undergone a mutation. 2: an agent that causes a mutation in dna. 3: a mutation that has affected one gene. 4: a chemical that can poison living cells.

Which of the following represents the correct format for the scientific name? a. staphylococcus aureusb. staphylococcus aureusc. staphylococcus aureusd. staphylococcus aureus

Next pretest: evolution select the correct answer in a laboratory population of flies, the female flies are gray and the males are yellowish gray. biologists observed that all the male flies had an equal chance for reproduction, but the male flies with the brightest colors were more likely to successfully reproduce. what phenomenon could explain such a change? a sexual selection b. disruptive selection c. stabilizing selection d. directional selection