Exam 27: Development Heredity

The rearrangement and migration of the cells of the bilaminar embryonic disc forms the trilaminar embryonic disc in a process called:

If two alleles code for the same trait (such as blond hair), they are said to be:

In order for a male to inherit a sex ^-linked (X ^-linked) disorder, he must receive the allele from:

What follows immediately after fertilization occurs?

Labor progresses through the following three stages:

Predict the possible genotypes of offspring of a couple who both are heterozygous for free earlobes. The trait for free earlobes are carried on the dominant allele while the trait for attached earlobes is carried on the recessive allele.

The four extraembryonic membranes that arise from the bilaminar embryonic disc are the chorion, amnion, allantois, and yolk sac.

Inherited traits controlled by two or more genes are called:

Explain the role of oxytocin in lactation.

What are the maternal and fetal contributions to the placenta?

The ductus arteriosus is a fetal vascular shunt that allows blood to flow from the pulmonary trunk directly into the aorta.

The initial stimulus for labor comes from the:

Which part of the embryo contributes to the fetal portion of the placenta?

During which stage of labor does the fetal head crown?

Dilation is the longest of the three stages of labor.

By which period of prenatal development will the placenta be fully formed?

Which of the following does NOT occur during the embryonic period?

Which hormones stimulate the growth of alveoli in the mother's mammary gland?

Anencephaly, a fatal condition, results from the failure of the anterior end of the neural tube to close properly, causing failure of the forebrain to develop. Determine and discuss the germ layer involved in this defect.

During which month of prenatal development will the fetus begin to develop reflexes?