Dressler Module 2 Prenantal Flashcards
(109 cards)
How many chromosomes do somatic cells haveDiploid
46
Gametes are created with how many chromosomes
23
____ Creates gametes (sperm and egg) and ensures variability in offspring
Meiosis
Gametogenesis
Process in which cells divide by meiosis to form gametes
Oogenesis
Results in one oocyte (ovum/egg)
Spermatogenesis
Occurs in testes results and sperm
Where does fertilization occur
In the outer third portion of the fallopian tubes
When does sex determination
At fertilization
Haploid number
23 chromosomes
Diploid number
46 chromosomes
Sperm and oocyte have how many chromosomes
23
Zygotes has how many chromosomes
46
Once an ovum is fertilized it is a
Zygote
After the ninth week a ____ becomes a ____ went tissues begin to form
Embryo Fetus
Gestation
Pregnancy
What are the stages of fetal development
Pre embryonic Embryonic Fetal
Describe what happens in each stage of fetal development Include the length of time that each stage last
The pre-embryonic (zygote) stage Occurs at two weeks when fertilization cell reproduction and implantation occursThe embryonic stage is from 2 to 8 weeks in which the embryo is nourished and develops The fetal stage is from the ninth week to birth and it is for growth and development of the fetus and usually last between 30 and 40 weeks
Morula
.
Blastocyst includes ____ cells
32
The ___ implants onto the uterus. The part of the ___ that does that is the ___
Blastocyst Blastocyst Trophoblast
The ____ develops within 35 days and becomes the embryo
Trophoblast
_____ Secretes HCG
Blastocyst
HCG signals ____ to stick around
The corpus luteum
The endometrium stays in place because of
Increased progesterone