spermatogenesis
When does spermatogenesis start?
Puberty
Explain the morphological stage
the physical transformation of a spermatids becoming a sperm
when does oogenesis begin and pause
in utero, birth
What phase of meiosis does the second division in maturation halt at until fertlization
metaphase
what prevents other sperm from entering the oocyte
zona reaction
Explain the multiplication phase
Mitosis produces a large number of spermatogonia (diploid- 46XY)
what part of the sperm breaks down the wall of the egg
Acrosome
what surrounds the primary oocyte during the growth phase
follicular/granulosa cells
anatomically, where does the second division of maturation take place
fallopian tubes
mitosis of zygote
Explain the first meiotic division
*diploid cells become 2 haploid cells (1-23X, 1-23Y)
*results in secondary spermatocytes
how many lobules does each teste have
Explain the first division of the maturation phase
diploid cell divides into unequal haploid cells; 1-large secondary oocyte 23X and 1-small first polar body
Explain the second division of maturation
secondary oocytes divide
results in (1-large ootid, 1-2- second polar bodies)
explain capacitation
7 hour period that the spermatids becoming goes through
*proteins are removed
*sperm become more mobile
*allows sperm to fertilize the egg
What is the result of the growth phase
primary spermatocytes
where does speratogenesis occur
seminiferous tubules
where is the egg released from and into
ovary, fallopian tube
What phase of oogenesis resumes at puberty
maturation
Once the secondary oocyte is fertilized, the oocyte and sperm can form their pronucleus, the cell is now called a…
ootid
Explain the second meiotic division of maturation
*haploid cells multiply (2-23X, 2-23Y)
*results in spermatids
when does spermiogenesis halt
Death
during what phase does the oocyte become the ootid
2nd division of maturation
Approximately how many oocytes are produced in utero
2 million
compaction