BIO 126 Lecture Notes - Lecture 19: Seminiferous Tubule, Follicular Phase, Gamete
11 May 2016
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Document Summary
The anatomy of the organism and the medium in which they are in can affect birthing patterns. Lacerta asexual reproduction in the absence of sperm. Females sometimes turn into males as shown here: a large male, which had been a female before changing sex, is seen among females, which are typically much smaller. However, the evolutionary advantage allows it to persist. The fact that it occurs shows that even though it has undergone mutations, evolutionary it is still beneficial: genetic. Sry gene on y converts gonadal tissues to testes. Zz/ zw frogs, amphibians, turtles, snakes, birds (not including those which are temperature sex determinant) Females release eggs into the water, males release sperm in vicinity of eggs. Aquatic environments prevent the eggs from drying out. However, the female doesn"t continuously lose resources to develop the eggs. Sperm are introduced into the female reproductive tract. Viviparity = young develop in mother and get nutrition from her blood.
