Exam 21: Human Development and Genetics

A person who is heterozygous for a particular trait has:

The blastocyst is an early embryonic stage, and the cells of the inner cell mass are ____________________, because they are not yet specialized.

In the embryo, the bones and muscles are derived from the ____________________.

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

If a trait may appear in a person's phenotype only when two genes are present for it, the trait is called ____________________.

The part of a blastocyst that secretes enzymes to permit implantation is the ____________________.

The embryonic membrane that has villi to provide for the nourishment of the early embryo is the ____________________.

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 ____________________.

A gene is the genetic code for one:

The umbilical vein carries blood from the ____________________ to the ____________________.

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

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

The average human gestation period is ____________________ weeks.

The zygote begins a series of cell divisions called ____________________, and the process of cell division is called ____________________.

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

Genetics problem: Mom is a carrier of red-green color blindness and Dad is red-green color-blind. What is the chance that their son will be color-blind?

Which of the following statements are true of dominant-recessive inheritance? (Read carefully and select all of the correct statements.)

A gene is the genetic code for ____________________.

The morula stage of early embryonic development may be described as a ____________________ of cells.

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