Exam #1 Flashcards
what are 5 biological events that happen during pregnancy
Fertilization of the egg by the sperm
Implantation of the fertilized egg into the uterus
Embryonic or fetal growth and development
Placental development and function
Maternal changes related to the pregnancy
Each gamete, egg or sperm contain what of the genetic material of individual
half
Union of egg (ovum) + sperm =
zygote
Zygote forms where
in fallopian tubes
Sperm must what in order to be viable
must be uniform size, highly mobile, secrete enzymes to dissolve egg membrane
Progesterone stimulates what
decidua, which supplies nutrition for embryo for up to 8 weeks
what supplies nutrition for first 5 days
endometrium
zygote travels down tube for how many days
6 days
the placenta does what
Prevents direct exchange blood: mother/fetus
Endocrine gland, secretes essential hormones
full term pregnancy lasts how last and is divided into how many semesters
last 40 weeks
three trimesters
preembryonic stage is when
first 14 days
embryonic stage is when
day 15 - week 8
fetal stage is when
end of week 8 until birth
Gametogenesis is what
=process in which cells undergo meiosis to form gametes.
Cleavage of cells is a
rapid process of cell division by mitosis of the zygote
clevage occurs approximately 30 hours after fertilization.
know this
Genetic defect def
abnormality which occurs at conception
Congenital defect def
abnormality in structure or function
Congenital defects account for what % of births
3-4% of all live births
for genetic counseling what is the Goal and what should be obtained
goal is to identify risk
Genetic history should be obtained using a questionnaire or checklist
Chromosomal Abnormalities
Occur when
the entire chromosome, or a large segment of a chromosome, is missing, duplicated or otherwise altered
chromosomal abnormalities can be detected how
Many of these abnormalities can be detected through prenatal screening