Exam 21: Human Development and Genetics

A pair of chromosomes that has maternal and paternal genes for the same traits is a ____________________ pair.

Just before birth,all of the fetus's organ systems are functioning except the ____________________ system.

Which of the following statements are true of labor and delivery? (Read carefully and select all of the correct statements.)

After birth,the foramen ovale in the baby's ____________________ is ____________________,which helps increase ____________________ circulation.

The early embryonic stage that is a solid sphere of cells is the ____________________.

In the early embryo,the mesoderm gives rise to the:

When the gene for a trait is found only on the X chromosome,the trait is said to be ____________________.

Which of the following statements are true of genetics? (Read carefully and select all of the correct statements.)

The placental hormones that prepare the mammary glands for lactation are:

Which statement is NOT true of the placenta and umbilical blood vessels?

Which of these embryonic structures is NOT paired with the correct primary germ layer from which it develops?

Which of the following statements are true of the embryonic membranes? (Read carefully and select all of the correct statements.)

Normal implantation of the blastocyst takes place in the:

A person has two genes for each genetic trait; these genes are called:

A person who is homozygous for a particular trait has:

During the first stage of labor,the cervix ____________________,and the amniotic sac ____________________.

The trophoblast of the blastocyst secretes enzymes to permit ____________________ in the uterus.

In order for a dominant trait to appear in the phenotype:

For people,a widow's peak is dominant and a straight hairline is recessive. Genetics problem: Both Mom and Dad are heterozygous for a widow's peak.The percent chance that a child of theirs will have a widow's peak is ____________________.

Which statement is NOT true of human chromosomes?