Human Reproduction

Which sequence represents the correct order of processes that result in the formation and development of an embryo?

• meiosis ---> fertilization ---> mitosis

• mitosis ---> fertilization ---> meiosis

• fertilization --> meiosis ---> mitosis

• fertilization --> mitosis --> meiosis

Which statement describes one function of the placenta in mammals?

• It allows blood of the mother to mix with the blood of the fetus.

• It contains fluid that protects the embryo from harm.

• It removes waste products that are produced in the cells of the fetus.

• It synthesizes food for the embryo.

Which two processes are included in the prenatal development of a single human embryo?

• gastrulation and differentiation

• menopause and cleavage

• puberty and gastrulation

• menstruation and fertilization

In humans, the period of development before birth is known as

• fertilization

• gestation

• pollination

• menstruation

Meiosis and fertilization are important processes because they may most immediately result in

• many body cells

• immune responses

• genetic variation

• natural selection

The fetus normally develops within structure

• A

• B

• C

• D

The placenta normally develops within structure

• A

• B

• C

• D

Cells containing only half the genetic information characteristic of this species are found at

• A

• D

• E

Exposure to toxins during early stages of pregnancy is more likely to cause birth defects than exposure in late pregnancy because

• essential organs form early in development

• the uterus provides more protection later in pregnancy

• the placenta forms late in pregnancy

• meiosis happens rapidly early in pregnancy

Which process normally occurs at the placenta?

• oxygen diffuses from the fetal blood to the maternal blood

• materials are exchanged between fetal and maternal blood

• maternal blood is converted into fetal blood

• Digestive enzymes pass from maternal blood to fetal blood.