Exam 20: Pregnancy, Growth, Development, and Genetics

The external reproductive organs can be distinguished by the __________ week of development.

A sperm cell needs to pass through several layers/structures in order to fertilize a secondary oocyte. What is the correct order of these layers?

What is the role of the hormone oxytocin in the birth process?

Factors that can cause malformations by affecting an embryo during its period of rapid growth and development are called teratogens.

When does the fetal stage of development begin?

What is the probability for the possible genotypes that result from the cross of two heterozygous parents?

When a sperm cell fertilizes an egg cell, a(n) __________ is formed.

What primary germ layer gives rise to the muscles and bones?

Immediately following birth, the newborn's metabolic rate __________, and its oxygen consumption __________.

Each cell of a human zygote contains ___________ chromosomes.

How many major blood vessels are typically found in the umbilical cord?

Within a blastocyst, the __________ becomes the embryo proper, and the __________ is involved in anchoring the blastocyst to the uterine lining.

The ductus arteriosus allows fetal blood to bypass the liver.

The hormone __________ suppresses uterine contractions while __________ promotes uterine contractions.

What sex chromosomes are found in normal male cells?

During early prenatal development, a hollowed-out ball of cells called the __________ forms, which will attach to the endometrium.

Where does fertilization normally occur?

What is the probability that a man with a straight hairline (genotype ww) and a woman with a widow's peak (genotype Ww) will have a child with a straight hairline?

Development includes growth and is a continuous process during which the individual changes from one life phase to another.

What extends from the embryo into the endometrium, contributing to the formation of the placenta?