Chapter 29: DSM
The Extra-embryonic membranes that develop from the endoderm and the mesoderm are the __________.
yolk sac and the amnion
Which of the following does NOT happen during oocyte activation?
The first cleavage is completed.
Which of the following events is NOT part of oocyte activation?
Fusion of the sperm pronucleus and egg pronucleus
Alterations in genetic activity during development result from __________.
the differences in the cytoplasmic compositions of individual cells
Which of the following statements is not related to differentiation?
Changes in the DNA of the cell
Which of the following enzymes are released from the acrosome of sperm?
Hyaluronidase and acrosin
What is the meaning of the term gestation?
All of prenatal development
Gastrulation produces three germ layers. Which of the following is not one of those layers?
Blastocoele
Which of the following forms the placenta?
Chorion
Which of the following is the term for the events that occur during the first two months of development after fertilization?
Embryological development
The term inheritance refers to which of the following?
The transfer of genetically determined characteristics from generation to generation.
What prevents more than one sperm from fertilizing the secondary oocyte?
Zonal inhibiting proteins
The fusion of male and female pronuclei is termed __________.
amphimixis
A hollow ball of cells created by cleavage is called a __________.
blastocyst
A sequence of cell divisions that begin after fertilization is called __________.
cleavage
The creation of different types of cells during the processes of development is called __________.
differentiation
The most dangerous period in prenatal or postnatal life is the __________.
first trimester
Fertilization usually occurs in the __________.
uterine tube
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
What triggers the activation of the secondary oocyte?
Fusion of the sperm and secondary oocyte membranes
Germ-layer formation results from the process of __________.
Gastrulation
What is the study of inheritance called?
Genetics
The term for what occurs when the blastocyst touches and grows into the endometrium is __________.
implantation
