, Genetic Diversity
Plants
C
stamen
<
c
Jana
⑥
Rho
ov u l e
]
]
( contains egg
°
filament
anther
cells )
sepod
stamen male part & plant ov u l e female part of plant stigma female part of plant
meiosis
type of
* a division essential
cell to produce gametes
*
plants anthers and ovules
animals testes and ovaries
*
gametes a re haploid (half the number of chromosomes )
in :
Occurs 2 divisions
Meiosis I
homologous pairs of chromosomes a re separated
- -
•
Meiosis 11 pairs of chromatids are separated
diploid cell
meiosis I
✓
meiosis 11
y
{ { { { haploid cells 4 haploid gametes t h a t a re
genetically different
>
genetic variation in
offspring
meiosis
① Interphase 1
DNA doubles a s chromosomes replicate by semi -
conservative replication . Individual chromosomes a re invisible .
Centrioles and
organelles replicate , protein synthesis occurs .
Respiration r a te increases to produce more ATP Cell increases
.
in s i ze .
② Prophase 1
Chromosomes condense and become visible .
Chromosomes join together to form a bivalent . This o c c u rs
during crossing over
Cana synapsis) Crossover .
point i s called a chiasmata - Centrioles move to opposite poles .
Spindle fibres form . Nuclear
envelopedisappears .
Plants
C
stamen
<
c
Jana
⑥
Rho
ov u l e
]
]
( contains egg
°
filament
anther
cells )
sepod
stamen male part & plant ov u l e female part of plant stigma female part of plant
meiosis
type of
* a division essential
cell to produce gametes
*
plants anthers and ovules
animals testes and ovaries
*
gametes a re haploid (half the number of chromosomes )
in :
Occurs 2 divisions
Meiosis I
homologous pairs of chromosomes a re separated
- -
•
Meiosis 11 pairs of chromatids are separated
diploid cell
meiosis I
✓
meiosis 11
y
{ { { { haploid cells 4 haploid gametes t h a t a re
genetically different
>
genetic variation in
offspring
meiosis
① Interphase 1
DNA doubles a s chromosomes replicate by semi -
conservative replication . Individual chromosomes a re invisible .
Centrioles and
organelles replicate , protein synthesis occurs .
Respiration r a te increases to produce more ATP Cell increases
.
in s i ze .
② Prophase 1
Chromosomes condense and become visible .
Chromosomes join together to form a bivalent . This o c c u rs
during crossing over
Cana synapsis) Crossover .
point i s called a chiasmata - Centrioles move to opposite poles .
Spindle fibres form . Nuclear
envelopedisappears .
