development and inheritance 1
Germ-layer formation results from the process of __________.
gastrulation
The term for what occurs when the blastocyst touches and grows into the endometrium is __________.
implantation
What is the fate of the cluster of cells in the blastocyst known as the inner cell mass?
the cells will develop into the embryo
Exchange between the embryonic and the maternal circulations occurs by diffusion across the syncytial and cellular trophoblast layers via __________.
the chorionic blood vessels
The Extra-embryonic membranes that develop from the endoderm and the mesoderm are the __________.
yolk sac and the amnion
What triggers the activation of the secondary oocyte?
Fusion of the sperm and secondary oocyte membranes
What happens in the process of hatching?
The zona pellucida is shed from the blastocyst.
Which of the following is NOT one of the germ layers formed during gastrulation?
Trophoderm
What is the extra-embryonic membrane that gives rise to the urinary bladder?
allantois
Which of the following is the term for the events that occur during the first two months of development after fertilization?
embryological development
What event marks the onset of development?
fertilization
Which of the following is the term for the developmental events events that occur between the ninth week and birth?
fetal development
What is the "moment of conception"?
fusion of the male and female pronuclei
The umbilical cord, or umbilical stalk, contains __________.
the allantois, blood vessels, and yolk stalk
What is the meaning of the term gestation?
All of prenatal development
Which of the following does NOT happen during oocyte activation?
The first cleavage is completed.
Gastrulation produces three germ layers. Which of the following is not one of those layers?
blastocoele
A hollow ball of cells created by cleavage is called a __________.
blastocyst
Which of the following forms the placenta?
chorion
A sequence of cell divisions that begin after fertilization is called __________.
cleavage
Throughout embryonic and fetal development, metabolic wastes generated by the fetus are eliminated by their transfer to the __________.
maternal circulation
The chorion develops from the __________.
mesoderm and the trophoblast
Fertilization usually occurs in the __________.
uterine tube
The fusion of male and female pronuclei is termed __________.
amphimixis
