Biology / Meiosis Flashcards
A) capsule of the ovary
B) secondary ovum undergoing 2nd meiotic division
C) corona radiata
D) follicular fluid
E) ampulla of the fallopian tube
F) fimbriae of the fallopian tube
what immunosuppressive factor appears in the mom’s plasma within hours of fertilization?
early pregnancy factor
when does monozygotic twinning occur?
after fertilization
where does the first sign of differentiation of embryo into different cell groups occur at?
blastocyst
The first mitotic cell division in the zygote occurs ___ hours after fertilization
30 hours
what is the most common site for fertilization?
ampulla of the fallopian tube
The embryo enters the uterine cavity as a ____, approximately _____ after fertilization
morula; 3 days
The G0 phase of the cell cycle commonly involves
phenotype differentiation
what produces oocytes? when are they expelled?
ovaries (via oogenesis)
during ovulation
how do oocytes get to the ampulla of the fallopian tube (where they’re fertilized)?
fimbriae of the uterine tube sweep the oocyte into the ampulla
what produces sperms? where are they stored?
testes (via spermatogenesis)
epididymis
how many sperms are ejaculated into vagina?
how many sperms pass through uterus and enter uterine tubes?
millions
several hundred
what triggers oocyte to complete its second meiotic division?
when it’s contacted by a sperm
what characteristic of the ovum tells you that ovulation has occurred?
1 polar body
what characteristic of the ovum tells you that fertilization has occurred?
2 polar bodies
