Consider a species of dinosaurs and assume that females are XX and males are XY. Further assume that black scales, B, is a sex-linked dominant trait and that green scales, b, is the recessive trait. The gene resides on the X gene only. A female dinosaur with black scales and […]

1. Do you believe that evolution is progressive? Why or why not? What does the Great Chain of Being (or Scala Naturae) have to do with the notion of progress and goals in evolution? What view does current thinking in evolutionary biology overwhelmingly support? 2. Streptococcus pneumoniae, or pneumococcus, is […]

Crocodiles of the Nile often attack and kill large animals (such as wildebeest) by dragging them under the water and drowning them! Crocodiles can do this because they have the amazing ability to stay under the water for an hour or more. Part of the explanation lies in the structure […]

Chase and Christina were studying for their last anatomy and physiology exam of the semester. After reviewing his notes on meiosis, Chase said, “Well, since meiosis is the same in males and females, I don’t need to study the meiosis notes from the female reproductive system lecture.” Christina quickly pointed […]