Exam 27: Development Heredity

Chorionic villus sampling (CVS) may be performed early in pregnancy to find certain problems with the fetus. Determine and describe the extraembryonic membrane that is being sampled.

Predict the possible blood types, or phenotypes, of offspring in which the father has blood type O and the mother has blood type AB.

When do the extraembryonic membranes form?

Melanocyte ^-stimulating hormone (MSH) is needed for the maturation of the fetal lungs and the production of surfactant.

By what week of prenatal development will organogenesis be complete?

Mrs. Laurenz learned during her appointment that she would be scheduled for a C ^-section. She is in her 36th week of pregnancy. Explain to her what happens during a C ^-section.

The fetal period extends from the beginning of week 4 until the end of week 8.

The organ systems rudimentarily form during the:

Explain the role of the chorion in formation of the embryonic part of the placenta.

A female will express the trait for an X ^-linked disorder only if she is homozygous for the recessive allele.

Discuss the function of ductus venosus in a fetus.

What contributes to the fetal portion of the placenta?

Explain how polygenic inheritance differs from multiple alleles.

An old saying goes, "For every child, a tooth is lost." This saying suggests that a mother may lose a tooth for each child she births. Predict the hormone responsible for this potential pregnancy issue.

The placenta, a temporary organ that is shed after the infant is born, is the site of exchange of oxygen, nutrients, and waste between the mother and fetus.

What do the umbilical arteries transport?

Which of the following steps must occur first during the embryonic period?

Determine when the fetal lungs begin producing surfactant and explain why it is important.

What major event occurs during the first stage of labor?

Which fetal hormone initiates labor?