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embryology questions with correct answers.
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embryology questions with correct answers.
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embryology questions with correct answersEmbryology Correct Answer-study of prenatal development
Prenatal development consists of three distinct periods Correct Answer-
the pre-implantation period, the embryonic period, and the fetal period
What periods make up the first trimester of pregnanacy Correct Answer-
the pre-implantaiton period and the embryonic period
What period comprises the last two trimesters Correct Answer-the fetal
period
It is important for dental professionals to understand what in prenatal
development Correct Answer-to understand the major events of prenatal
development to understand better the development of the structures of
face, neck, and oral tissue and underlying relationships among these
structures
Primordium Correct Answer-earliest indication of a part or an organ
during prenatal development, all structures have this
Know teratogens involved in congenital malformations Correct Answer-
drugs(tetracycline, ethanol, lithium), chemical(methylmercury,
polychlorinated biphenyls), infections (rubella virus, herpes simplex
virus, human immunodeficiency virus, syphilis microbe), radiation(high
levels of ionizing type)
,Preimplantation period of prenatal development Correct Answer-period
of the unattached conceptus, takes place during the first week
Zygote Correct Answer-union of ovum and sperm forms a fertilized egg
During fertilization, the final stages of what occurs Correct Answer-
meiosis, diploid chromosomes, half from ovum, half from sperm
After fertilization, zygote under goes Correct Answer-mitosis, individual
cell division(cleavage)
Morula Correct Answer-after intial cleavage, solid ball of cells
Blastocyte Correct Answer-zygote becomes a vesicle, also known as
blastula, after ongoing process of mitosis, many cells
When does the blastocyte stop traveling Correct Answer-end of the first
week, then undergoes implantation, embedded in prepared endometrium
Trophoblast layer Correct Answer-after 7 days of cleavage, blastocyst
consists of a layer of peripheral cells
Embryoblast Correct Answer-small inner mass of embryonic cells
, Trophoblast gives rise to Correct Answer-important prenatal support
tissues
Embryoblast layer gives rise to Correct Answer-to embryo during next
prenatal period
Down syndrome Correct Answer-trisomy 21, extra 21 chromosome after
meiotic division, at risk of periodontal disease and fewer and abnormally
shaped teeth, arched palate, poor use of tongue muscles
Cell becomes zygote after how many hours: Correct Answer-12-24
Cell divides into two cells after how many hours Correct Answer-30
hours
Cell divides into 4 cells after how many hours Correct Answer-40-50 hrs
Cell divides into 8 cells after how many hours Correct Answer-60 hrs
Cell divides into 12-16 cells after how many days Correct Answer-4
days
Blastocyte at which day Correct Answer-5 days
Implantation occurs how many days Correct Answer-6 days
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