Exam 43: Animal Development

How is blood flow in the placenta maintained so that there is maximum opportunity for the exchange of materials while still keeping the blood of the mother and the baby separate?

Birds hatch out of their eggs looking like small versions of the adult. This is an example of

Which extraembryonic membrane lies immediately beneath the shell of a reptile embryo?

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

When a researcher transplanted the nucleus of an intestinal cell from a tadpole into an egg cell whose nucleus had been destroyed, the egg developed into a normal frog. This illustrates that

Why do organisms that have indirect development produce hundreds of offspring, whereas those with direct development produce relatively few offspring?

__________is the medication given to combat morning sickness that caused deformed and missing limbs in infants in the late 1950s and early 1960s.

The embryo of a __________undergoes direct development.

Prior to birth, stretching of the cervix by the babyʹs head stimulates the release of

Newborn animals that closely resemble the adults of their species undergo__________development.

The hormone__________ promotes both mammary gland development and milk production.

Longevity in animals appears to be most related to their cellsʹ ability to repair damage to their own DNA.

What is a gastrula?

What makes the cells of a developing embryo differentiate into various types of cells?

Early animal embryos are composed of stem cells, unspecialized cells that are capable of dividing and renewing themselves for long periods. If a stem cell divides by mitosis so that one cell eventually becomes part of the brain and the other cell becomes part of a salivary gland, the cells have

A recent series of TV commercials promoted the idea that a woman who wants to have a healthy baby must begin to eat well and avoid some medications and alcohol before she knows she is pregnant. Why?

In indirect development, the embryo hatches into a sexually immature stage called a larva.

The extraembryonic membrane that sends blood vessels into the endometrium is the chorion.

Maternal blood and fetal blood are mixed in the placenta.

The process by which an organism proceeds from fertilized egg through adulthood is__________.