D3. 1 Reproduction
Asexual Reproduction:one parent, seen in bacteria, fungi
+mitosis followedby cell division
Advantage:large number of off spring for a short
period of time
Disadvantage:low genetic variation (disastrous for environmental
condition
changel
Sexual Reproduction: +
requires 2
parents
~
Involve fusion of gamete
-Similar identical
to not
parents, but genetically
Advantage:genetic variation, better adaptedto changing environmental
conditions
Disadvantage:Time & energy consuming, complex process
Cause of variation in sexual reproduction
genetic
+Meiosis I
(crossing -
over
& swapping)
+ Meiosis & II:Random
I assortment
-Random fertilisation of male female
gametes
DifferenceBetween Gamete
fertilisation, a gametes fuse
process of together to produce zygote
+
smaller the two the male of sperm
The is
gameter
+ of
female
while
larger is
, Sperm Egg
+Egg or Ova are
larger & immotile
musttravel up
female reproductive +carry foodreserve acts as
energy
for
tract=> smaller source
dividing zygote
& motile
+ tails (flagella) help to
swim
+ mitochondria to
generate
energy
for movement
of
+millions
sperms produced
everyday to increase chance
, Fertilisation
Egg Prior to
+has completed meiosis IIs referred to
secondary oocyte
not
yet
cortical filled
cytoplasm contain
granule with
enzyme
+
+ outer plasma membrane:
the zone pelluci la
+
the
+
corona radiata
The sperm prior to fertilisation
-
Head, midpiece, & tail
head contain
+
haploid nucleus, cap like acromsome
which contains
hydrolytic enzyme & paired centriole
+midpiece mitochondria that the of
movement
carry powers
sperm
+ Tail is a
flagellum that helps in movement
Asexual Reproduction:one parent, seen in bacteria, fungi
+mitosis followedby cell division
Advantage:large number of off spring for a short
period of time
Disadvantage:low genetic variation (disastrous for environmental
condition
changel
Sexual Reproduction: +
requires 2
parents
~
Involve fusion of gamete
-Similar identical
to not
parents, but genetically
Advantage:genetic variation, better adaptedto changing environmental
conditions
Disadvantage:Time & energy consuming, complex process
Cause of variation in sexual reproduction
genetic
+Meiosis I
(crossing -
over
& swapping)
+ Meiosis & II:Random
I assortment
-Random fertilisation of male female
gametes
DifferenceBetween Gamete
fertilisation, a gametes fuse
process of together to produce zygote
+
smaller the two the male of sperm
The is
gameter
+ of
female
while
larger is
, Sperm Egg
+Egg or Ova are
larger & immotile
musttravel up
female reproductive +carry foodreserve acts as
energy
for
tract=> smaller source
dividing zygote
& motile
+ tails (flagella) help to
swim
+ mitochondria to
generate
energy
for movement
of
+millions
sperms produced
everyday to increase chance
, Fertilisation
Egg Prior to
+has completed meiosis IIs referred to
secondary oocyte
not
yet
cortical filled
cytoplasm contain
granule with
enzyme
+
+ outer plasma membrane:
the zone pelluci la
+
the
+
corona radiata
The sperm prior to fertilisation
-
Head, midpiece, & tail
head contain
+
haploid nucleus, cap like acromsome
which contains
hydrolytic enzyme & paired centriole
+midpiece mitochondria that the of
movement
carry powers
sperm
+ Tail is a
flagellum that helps in movement
