Exam 33: Reproduction and Development

The graph below shows the normal concentration of morphogens A and B throughout a Drosophila embryo. If morphogen B is injected into the head end of an embryo, the embryo is likely to develop

By the end of a normal first trimester, the zygote has

The highest teen birthrates are in areas where

The skulls of newborn humans and chimpanzees closely resemble each other.

Human females probably evolved the ability to live beyond their reproductive years because

In humans, the yolk sac

The "quality" of human eggs and sperm declines as people age. One possible reason for this is

The four sperm produced by spermatogenesis is identical to the sequence of the sperm precursor cell.

Which of the following statements about animal sperm and eggs is false?

Sperm are packed with mitochondria because mitochondria produce the

Humans complete their development in a protected environment inside their mother's body, in the

Hermaphrodites are able to fertilize their own eggs with their own sperm.

In humans, the exchanges of materials between the embryo and its mother occur through the

Which of the following statements about sexual and asexual reproduction is true?

The second meiotic division in a secondary oocyte is completed

Many animals are choosy about their mates because

Spermatogenesis results in the production of ____________________ sperm, whereas oogenesis produces just one egg.

Study the diagram below. Which of the following sentences is true?

Examine this close-up of the placenta (on the left of the figure below). Why do the chorionic villi have the shape of a tree?

When a human embryo is approximately 7 days old, it embeds in the ____________________ of its mother's uterus, where it is nourished by the surrounding blood supply until the placenta is functional.