sex determination of zygote Flashcards
1
Q
eggs are xx or xy?
A
xx
2
Q
sperm are XX or XY?
A
half and half
3
Q
what controls region of Y chromosome?
A
Sry gene, which is a transcription factor
4
Q
cleavage goes from … to ..
A
morula to blastocyst
5
Q
ICM
A
inner cell mass, inside blastocyst
6
Q
trophectoderm cell layer
A
surrounds ICM in blastocyst
7
Q
when does blastocyst hatch?
A
after loss of ZP, prior to implantation
8
Q
when does cleavage begin?
A
after zygote is formed in uterine tube
9
Q
what does first cleavage form?
A
blastomers
10
Q
what does first cleavage then lead to?
A
this leads to morula and then to blastula.
11
Q
when is blastocyst ready?
A
on day 5, after 120 hours
