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Gametogenesis
Human gametogenesis
Spermatogenesis
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Spermatogenesis
Formation of
spermatozoa
What is the male gamete in humans known as?
Spermatozoa
How many spermatozoa does each primordial germ cell result in?
Each
primordial germ cell
results in
large
numbers of
spermatozoa
Order of cell formation in spermatogenesis
Primordial germ cell
Spermatogonia
Primary spermatocyte
Secondary spermatocytes
Spermatids
Spermatozoa
Process of spermatogenesis
Primordial
germ cell undergoes several rounds of
mitosis
to form
spermatogonia
Spermatogonia
undergo
growth
but no
division
(with a longer
G1
phase) to form a
primary spermatocyte
The
primary spermatocyte
undergoes
half
of a
meiosis
(
P1
,
M1
,
A1
,
T1
) to form
secondary spermatocytes
Th
secondary spermatocytes
undergo the second half of
meiosis
(P2,M2,A2,T2) to form
spermatids
The
spermatids
undergo
differentiation
to form
spermatozoa
What are the characteristics of spermatozoa?
Many
,
mini
,
motile
Adaptations of spermatozoa
Acrosome
- contains
enzymes
to penetrate
ovum
Mitochondria
in
middle
section - provides
ATP
Nucleus
- genetic material is
condensed
, so less
energy
is required to
transport
it
Microtubules
- provide
whip-like
movements
Flagellum
-
rotates
rapidly to
propel
the cell
Is a primary spermatocyte a diploid or haploid cell?
Diploid
Are the spermatogonia diploid or haploid cells?
Diploid
Are the spermatids diploid or haploid cells?
Haploid
What process takes the primordial germ cell into spermatogonia?
Mitosis
What process takes the spermatids into spermatozoa?
Differentiation
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