Exam 24: Development and Inheritance

The term used to describe the actual genetic makeup of an organism is

Both the placenta and the corpus luteum produce the hormone relaxin during pregnancy.

Anencephaly is a neural tube defect that results in the development of a fetus lacking a brain. This defect occurs about once in every 1000 births.

The principal hormone involved in promoting milk production by the mammary glands is

Metafemale syndrome is a sex chromosome disorder with the following genotype:

The primitive ectoderm layer of the inner cell mass of the early embryo is also known as the

Name the three primary germ layers of an embryo and describe the main anatomical structures that develop from each layer.

The corpus luteum continues to secrete progesterone for _____ after fertilization to help maintain pregnancy and to prepare the mammary glands to secrete milk.

The nuclei of all human cells, except gametes, contain

Homologous chromosomes contain genes that control the same traits.

The scientific study of the sequence of events from fertilization of a secondary oocyte until the formation of an adult organism is called

The functions of the yolk sac include providing nutrients to the embryo during the second and third weeks of development and supplying blood cells to the embryo from the third through the sixth week of development.

The sex chromosomes are also responsible for the transmission of a number of nonsexual traits.

Phenylketonuria (PKU)is a sex-linked inherited disorder.

Successive cleavages of the zygote produce a solid sphere of small cells called the

Which of the following placental hormones helps ease delivery of a baby through the birth canal by stimulating the loosening of pubis symphysis, along with the sacroiliac and sacrococcygeal joints?

The allantois develops into the fetal portion of the placenta.

Which of the following is NOT an existing fertility-expanding technique?

X and Y chromosomes are sex chromosomes.

While all the organ systems are present at the end of the embryonic period, most of the growth of these organ systems occurs during the fetal period.