ZOO501 Quiz 3 Fall 2020 by M Zahid

1. In mammalian cleavage at 64-cell stage, the inner cell mass and the _______ cells have become separate cell layers, neither contributing cells to the other group....Trophoblast
2. The narrow connecting stalk of extra-embryonic _____ that links the embryo to the trophoblast eventually forms the vessels of the umbilical cord………………….….Mesoderm
3. The rudiment of the central nervous system, is called_______........................Neurulation
4. Fishes,______, and birds undergo discoidal meroblastic cleavage, wherein the early cell divisions do not cut through the yolk of the egg…………………………………………….….Reptiles
5. Chorion is derived from ______ cells………………………………………………………….… trophoblast
6. The first segregation in mammalian cells within the inner cell mass results in the formation of the _______................................................................... Primitive endoderm
7. The original type of trophoblast cells constitutes a layer called the…….… Cytotrophoblast
8. Neurulation in ______ is exclusively secondary……………………………………………………Fishes
9. Fraternal twins are the result of ____ separate fertilization events………………..………Two
10. In mammalian cleavage _______ catches the blastocyst on an extracellular matrix containing collagen, laminin, fibronectin, hyaluronic acid, and heparin sulfate receptors……………………………………………………………………………………………..…. Endometrium
11. The mammalian embryo obtains nutrients directly from its_______................... Mother
12. The cytotrophoblast initially adheres to the ______ through a series of adhesion molecules………………………………………………………………………………………………... Endometrium
13. While gastrulation process in mammalian ______ becomes rich in the blood vessels that will provide oxygen and nutrients to the embryo………………………………………………. Decidua
14. Mother provides the fetus with nutrients and oxygen, and the fetus sends its waste products _______ into the maternal circulation…………………….. Carbon dioxide and urea
15. Discoidal meroblastic cleavage occur in_________............................... birds and reptiles

MUHAMMAD ZAHID · Zoo501 Developmental Biology · MCQs · Fall 2020(13 February 2020) · Quiz 3 · Final Term

16. During mammalian cleavage the trophoblast cells secrete fluid into the morula to create a blastocoels this process called as………………………………………………………………... Cavitation
17. The prechordal _______ induces the formation of the forebrain; the chordamesoderm induces the formation of the midbrain, hindbrain, and spinal cord……………………… Plate