A normal human pregnancy lasts forty weeks, divided into 3 trimesters. Which is a key event during the first trimester of pregnancy? The embryo is forming all its major structures and is most sensitive to alcohol and drugs O Most organ systems are fully developed and functional The lungs develop and the head points down toward the cervix O The gender of the fetus can be determined without studying the chromosomes

Describe the events taking place during oogenesis? Match the different phases with meiotic events taking place?

How is and egg (oocyte) prepared during oogensis for fertilization? Why is preparation essential to development?

A human with the SRY gene would:    a   produce eggs during gametogenesis b   have wolffian ducts degrade and ovaries form during development c   have mullerian ducts degrade and testes form during development d   have two X chromosomes  e   not have a bipotential gonad