Exam 43: Animal Development

How do undifferentiated cells ʺknowʺ what to become?

Mitotic cell divisions of the zygote are collectively called cleavage.

A developing human is considered an embryo after__________ weeks.

Which germ layer forms the pancreas?

The developing fetus secretes chorionic gonadotropin only during the first 2 weeks of pregnancy.

The proteins that bind to the DNA near regions where gene transcription begins are called

-The structure labeled 2 is the

Stem cells developed by inserting genes that regulate the transcription of specific genes into cells from an adult are __________cells.

The mesoderm develops into the dermis of the skin and the skeleton.

Which of the following occurs in the placenta?

One characteristic of animal development is the specialization in both structure and function that cells undergo. This is called

An embryo was exposed to a chemical early in its development. At birth, there is chromosomal damage to the circulatory system linked to the chemical exposure. What other organ systems should be examined for the same type of damage?

What occurs during organogenesis?

German measles is a very mild infection, so why is vaccination against German measles required by most colleges?

The most rapid differentiation in an embryo occurs during the first 2 months of pregnancy.

Recent studies have shown that cells of the dorsal lip of the blastopore contain active__________genes that code for proteins that are able to induce the development of other cells.

In species with direct development, fewer offspring are produced, but a higher proportion survives to adulthood.

__________genes code for transcription factors that regulate the transcription of other genes.

The blastocyst implants in the endometrium about 7 days after fertilization.

__________is the developmental event that results in the formation of a primitive gut and the three tissue layers.