Chapter 3 Review

Question 1

Fetal portion of placenta

Answer 1

Chorion

Question 2

Formation of three primary germ layers

Answer 2

Gastrulation

Question 3

Gives rise to most of urinary system

Answer 3

Intermediate mesoderm

Question 4

Single cell produced by fertilization

Answer 4

Zygote

Question 5

Fluid filled membranous sac around fetus

Answer 5

Amnion

Question 6

Forms brain and spinal cord

Answer 6

Neural tube

Question 7

Structure that implants in the uterus

Answer 7

Blastocyst

Question 8

Forms muscle and the axial skeleton

Answer 8

Paraxial mesoderm

Question 9

Solid ball of cells during cleavage

Answer 9

Morula

Question 10

Cell layer facing yolk sac in bilaminar germinal disc

Answer 10

Hypoblast

Question 11

Fertilization of the secondary oocyte usually occurs in the

Answer 11

Uterine tube

Question 12

The outer layer of the blastocyst that attaches to the wall of the uterus at implantation is called the

Answer 12

Trophoblast

Question 13

At about day 3 after fertilization, the cells of the pre-embryo adhere tightly to each other and increase their surface contact in a process called

Answer 13

Compaction

Question 14

Somites develop from

Answer 14

Paraxial mesoderm

Question 15

During gastrulation, cells from the ____ layer of the bilaminar germinal disc migrate and form the three primary germ layers

Answer 15

Epiblast

Question 16

An abnormal number of chromosomes in a cell following meiosis occurs as a result of

Answer 16

Nondisjunction

Question 17

The cells of the embryoblast differentiate into the ____ and the ______

Answer 17

Epiblast, hypoblast

Question 18

Is the mesoderm an extraembryonic membrane?

Answer 18

No

Question 19

Capacitation occurs when sperm

Answer 19

Are deposited within the female reproductive tract

Question 20

The beginning of brain and spinal cord formation is termed

Answer 20

Neurulation

Question 21

Describe “crossing over”

Answer 21

Crossing over helps shuffle the genetic material between maternal and paternal chromosomes in the cell. Moving genetic material between these chromosomes forms genetically diverse sex cells that have the potential to produce a human being with its own unique array of traits