Exam 20: Pregnancy, Growth, Development, and Genetics

Which of the following indicates the correct order of phases of development?

Sperm movement is aided by the presence of compounds called __________ in semen.

What is a symptom of fetal alcohol spectrum disorder (FAS)?

What term describes a person with two identical variants (alleles) for a gene?

During the early stages of pregnancy, the hormone __________ maintains the corpus luteum until the placenta is established.

What event triggers meiosis II in a secondary oocyte?

What is contained within the amniotic cavity?

During the second and third trimesters, the uterine lining is maintained by the secretion of what hormone(s)?

Cystic fibrosis is due to a recessive gene that affects the functioning of chloride channels. What is the genotype of an individual with this disease?

Surfactant is necessary to increase surface tension in the lungs of a newborn.

What is the probability for the possible phenotypes that result from the cross of two heterozygous parents (Aa and Aa)? (The A allele is for normal pigmentation, and the a allele is for albinism.)

Individuals with the homozygous recessive genotype (ss) for sickle-cell anemia will have the disease. Those with the heterzygous genotype (Ss) will have the sickle-cell trait, a mild form of the disease. Those with the homozygous dominant genotype (SS) will not have any symptoms. What is the name of this kind of inheritance pattern?

The ductus arteriosus carries blood from the __________ to the __________.

What blood vessel carries blood from the placenta to the fetus?

From what vessels do the umbilical arteries arise?

Each gene can have variations within its DNA sequence. These variants are called __________.

By what route do drugs ingested by a pregnant woman most likely reach her fetus?

Hemophilia A is an X-linked recessive trait. Which would be true about the parents of a hemophiliac son?

Within a blastocyst, what group of cells give rise to the body of the developing offspring?

What enzyme, located on the sperm cell membrane, is needed to help the sperm penetrate an egg cell?