Biology Questions and Answers
- What is the relation
between fecundation and the
end of the meiotic process
during oogenesis?
The oocyte Imeiotic division (interI only completrupted ates the second
metaphase) gamete occurs.if fecundation b (One can say thereforey a male (^)
that in fact the female gamete is the
oocyte II).
- What is the second polar
body?
After terminatiodivision of the oocyte In of the second meioticI two cells are
generated: the egg cell proper and the
second polar bbody is a very small cell that almostody. The second polar
lacks cytoplasm and stays adnexal to
the egg cell. Tcontent of the oocyte he entire cytoplasmicII passes to the (^)
egg cell.
- What is the relationship
between the menstrual cycle
and ovulation?
Ovulation is the releasing of the female
gamete periodical event that occurs dufrom the ovary. Ovulation isring each a (^)
menstrual cycle. Considering as the first
day of the menstrualmenses begins, the ovulation cycle the day when occurs
around the 14th day when the
concentrations ofFSH reach high levels. the hormones LH and
- How does the male
gamete penetrate the egg
cell? How does the female
gamete protect itself from the
entrance of more gametes
after the entrance of the first
sperm cell?
The sperm cell that reaches the egg cell
process in wtriggers the acrosomhich hydrolytice reaction, enzymes oa^ f
the acrosome are released on the
external su(the protective layer rface of the zona pellucidathat surrounds the (^)
egg cell). A portion of this layer is
digested ballowing the sperm cell to y the acrosomal enzymesreach the (^)
plasma membrane of the egg cell
carrying out fecundation.
At the moment that the sperm cell
makes contactmembrane a chemical alteration o with the egg cell (^) f this
membrane occurs. Enzymes secreted by
exocytosiszona pellucida (corticalunable to bind to other reaction) make the
sperm cells (zmale gametes cannonal reaction) anot enter the egg cell.d other
- What are the female
pronucleus and the male
pronucleus?
The female phaploid nucleus of the egg cell. Maleronucleus is the proper (^)
pronucleus is the haploid nucleus of the
sperm cell tcell. After fecundation bhat has fecundated the eggoth pronuclei
fuse forming the nucleus of the diploid
zygote.
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