Exam 53: Animal Development

In 1998, researchers found that genes similar to the Drosophila gene tinman are necessary for heart development in vertebrates.What can you conclude about the ancient bilaterian ancestor of insects and vertebrates over 500 million years ago?

What is the first milk that is produced after birth called?

Certain groups of cells move inward from the surface of the blastula in a carefully orchestrated migration called

What factors stimulate uterine contractions and birth?

A research group claims that they have discovered microscopic fossilized embryos, including some at the blastula stage, but other researchers are skeptical.Finally, one student develops a technique for splitting the embryos in half to reveal the substructure.Cutting open the first blastocyst embryo, the student is very excited."It is a blastula!" she shouts,"Look, you can see the ____________________ inside!"

New mothers may benefit from the aid of lactation consultants when learning to breastfeed.These consultants give advice on technique, and help the mother to feel relaxed and confident.What hormone is associated with calm, warm emotions and is also critical for the milk let-down reflex?

Which of the following animals undergoes true holoblastic cleavage?

The developing embryo of reptiles, birds, and mammals is encased in the fluid-filled ________ membrane.

What actually begins the uterine contractions which leads to giving birth?

What is the main role of human chorionic gonadotropin?

In mammals, embryonic cells form an inner cell mass that will become the body of the embryo and a layer of surrounding cells that will become the chorionic membrane and placenta.What are these surrounding cells called?

The hollow crater formed during gastrulation is known as

Removing some fluid from directly around a developing human fetus is performed by inserting a long needle into the belly of the female patient.What extraembryonic membrane will be punctured in this process?

What basic developmental challenge is solved by the organizer?

A couple conceives at the beginning of January.During which month will their child be undergoing organogenesis?

What is critical to the development of neural crest cell derivatives?

To your chagrin, you and your labmate have discovered that you both labeled your petri dishes "A", "B", and "C".How can you distinguish your sea urchin gastrula embryos from her frog gastrula embryos?

In a normal mammalian birth, how does the body guarantee that birth proceeds to completion?

The human placenta is formed by the interaction of uterine tissue and what extraembryonic tissue?

What is the role of cleavage in the early embryo?