plant life cycles meiosis review cell starts diploid –e–ex: human = 46 chromosomes cell divides...
TRANSCRIPT
Plant Life Cycles
Meiosis Review• Cell starts diploid
– Ex: Human = 46 chromosomes
• Cell divides twice to create 4 cells
• End result: Haploid cells– Ex: Human = 23
chromosomes
• Cells created: Sperm, egg, pollen
Alternation of generations (In general)• Diploid zygote created• Diploid zygote grows
into a diploid sporophyte
• Haploid spores created by meiosis
• Haploid spores grow into haploid gametophytes– Male gametophyte
creates haploid sperm– Female gametophyte
creates haploid egg
• Sperm and egg fuse to make a diploid zygote
• Cycle restarts
Moss Life Cycle
gametophyte
1)Moss gametophytes grow near the ground (haploid stage)
2) Through water, sperm from the male gametophyte will swim to the female gametophyte to create a diploid zygote
3) Diploid sporophyte will grow from zygote
4) Sporophyte will create and release haploid spores
.....sporophyte
eggegg
egg egg
malemale male malefemalefemalefemalefemale
zygotezyg
ote
zygote
zygote
5) Haploid spores land and grow into new gametophytes
.
groundgametophyte
6) The process repeats
gametophyte
.....sporophyte
eggegg
egg egg
malemale male malefemalefemalefemalefemale
zygotezyg
ote
zygote
zygote
5) Haploid spores land and grow into new gametophytes
.
groundgametophyte
6) The process repeats
Fern Life Cycle
AdultSporophyte (diploid)
.
..
.
1) Sporophyte creates and releases haploid spores
ground
.
.
.
.
ground
2) Haploid spores land in the soil
ground
3) From the haploid spores, gametophyte grows in the soil
Let’s zoom in
4) Sperm swim through water from the male parts (antheridium) to the female parts (archegonia)Let’s zoom back out
eggegg
egg
zygote
zygote
zygote
ground
5) Diploid sporophyte grows from the zygote
sporophyte
6) Fronds uncurls into leaves.
ground
7) Cycle repeats -- Haploid spores created and released
.
.
..
AdultSporophyte (diploid)
.
..
.
1) Sporophyte creates and releases haploid spores
ground
.
.
.
.
ground
2) Haploid spores land in the soil
ground
3) From the haploid spores, gametophyte grows in the soil
Let’s zoom in
4) Sperm swim through water from the male parts (antheridium) to the female parts (archegonia)Let’s zoom back out
eggegg
egg
zygote
zygote
zygote
ground
5) Diploid sporophyte grows from the zygote
sporophyte
6) Fronds uncurls into leaves.
ground
7) Cycle repeats -- Haploid spores created and released
.
.
..
Conifer Life Cycle
1) Male and female seed cones grow in adult sporophytes
2) Pollen grains released from the male seed cones-- Pollen is the male gametophyte
eggzygote
egg egg
egg
zygote
zygote
zygote
Male cones make pollen Female cones make eggs
3) Seeds begin to harden inside the female cones
seed
seed
seed
seed
4) Seeds released
5) Seed will land
ground
6) Seedling grows into (sporophyte)…the cycle repeats
ground
1) Male and female seed cones grow in adult sporophytes
eggzygote
egg egg
egg
zygote
zygote
zygote
Male cones make pollen Female cones make eggs
3) Seeds begin to harden inside the female cones
seed
seed
seed
seed
4) Seeds released
5) Seed will land
ground
6) Seedling grows into (sporophyte)…the cycle repeats
ground
Angiosperm Life Cycle
Pollen stick to animal or released into wind
Animal finds a new flower to feed on
Pollen transferred to the stigma….seeds develop
eggzygote
Fruit ripens to help disperse seeds
zygote
Fruit falls to ground
Animals eat fruit….seeds come out the other end…cycle repeats
seed
Pollen stick to animal or released into wind
Animal finds a new flower to feed on
Pollen transferred to the stigma….seeds develop
eggzygote
Fruit ripens to help disperse seeds
zygote
Fruit falls to ground
Animals eat fruit….seeds come out the other end…cycle repeats
seed
End of the Semester!