Textbook Quiz - Development System

Question 1

The intervillous spaces of the placenta
- are derived from the chorion
- contain maternal blood
- are rich in hCG and HCS
- enlarge under the influence of relaxin

Answer 1

contain maternal blood

Question 2

when does the trophoblast develops into two layers

Answer 2

after implantation

Question 3

when do the arm and leg buds form and the heart is beating?

Answer 3

by the end of the first month of gestation

Question 4

After implantation, the only tissue of the developing embryo to come in direct contact with maternal tissue is the

Answer 4

trophoblast

Question 5

Functional changes that sperm undergo in the female reproductive tract will allow them to fertilize a secondary oocyte are termed

Answer 5

capacitation

Question 6

implantation is the process where the

Answer 6

blastocyst attaches to and enters the endometrium

Question 7

implantation occurs how long after fertilization

Answer 7

about 6 days

Question 8

The developing embryo is surrounded by and bathed in

Answer 8

amniotic fluid

Question 9

the embryonic portion of the placenta develops from the

Answer 9

chorion

Question 10

In the umbilical cord, there are how many arteries and how many veins

Answer 10

two arteries that carry deoxygenated blood and one vein that carries oxygenated blood

Question 11

The testes have descended into the scrotal sac of a male fetus that is

Answer 11

full-term

Question 12

What is an agent that causes developmental defects in the embryo called?

Answer 12

teratogen

Question 13

Amniocentesis can produce results that indicate

Answer 13

the presence of certain genetic disorders such as Down syndrome

Question 14

Early pregnancy tests depend on the detection of __ in the urine

Answer 14

human chorionic gonadotropin (hCG)

Question 15

Chorionic villi sampling (CVS), although riskier, has an advantage over amniocentesis because CVS

Answer 15

yields test results in a few days

Question 16

At the end of a full-term pregnancy, the top of the uterus reaches

Answer 16

nearly to the xyphoid process of the sternum

Question 17

The placental stage of labor ends with

Answer 17

expelling of the after birth

Question 18

If pregnancy continues for 2 weeks beyond the due date, there is a chance of brain damage to the fetus because of

Answer 18

an aging placenta

Question 19

Which of the following is NOT a change that occurs after birth, as a fetus becomes a newborn baby?
- the lungs fill with air for the first time
- the umbilical arteries fill with a connective tissue
- the ductus arteriosus provides a connection to the inferior vena cava
- foramen ovale closes and becomes the fossa ovalis

Answer 19

the ductus arteriosus provides a connection to the inferior vena cava

Question 20

In what process, does the uterine smooth muscle returns to its normal size more rapidly in nursing than non-nursing mothers

Answer 20

process of lactation

Question 21

A hormone called ___, released from the anterior pituitary gland stimulates the production of milk by the mammary glands

Answer 21

prolactin

Question 22

If a man with hemophilia marries a woman who does not carry the hemophilia gene, which of the following concerning their children is probable?
- all of the sons will be carriers
- all of the sons will have hemophilia
- all of the daughters will be carriers
- one half of the sons will have hemophilia and one half will be carriers

Answer 22

all of the daughters will be carriers

Question 23

A mother will blood type B and a father with blood type A have four children. One child is type AB, one is A, one is B, and one is type O. Which of the following represents the genotypes of the parents?

Answer 23

IA i x IB i

Question 24

The phenotype of an individual refers to the

Answer 24

physical or outward expression of a gene

Question 25

If a couple are both heterozygous for the gene that cause PKU, the probability that their child will have PKU is

Answer 25

25%

Question 26

Sickle-cell disease is an example of

Answer 26

incomplete dominance

Question 27

How many alleles are present in humans that produce the phenotype of the four blood types of the ABO blood groups?

Answer 27

three

Question 28

Am embryo develops into a normal baby girl because it

Answer 28

lacks the SRY gene

Question 29

The gene for red-green colorblindness is represented by the symbol ‘c’. The normal allele is represented by ‘C’. An individual with the genotype XC Xc would be a

Answer 29

normal carrier female

Question 30

Fertilization in a laboratory dish and transfer of the developing embryo into the uterus is called

Answer 30

in vitro fertilization (IVF)