1. Chlamydomonas
Prepared by:
Juliet Marie Theresa M. Villar

2. Chlamydomonas Single celled green alga
Grows in ponds, ditches, and wet soil
believed to be primitive
reproduces asexually by producing ZOOSPORES
Reproduces sexually by producing ZYGOTES

3. Parts of
Chlamydomonas

4. Life Cycle

5. Asexual Reproduction A mature cell of Chlamydomonas is a haploid
The zoospores grow into mature
haploid cells, completing
the asexual life cycle.
These daughter cells
develop flagella and
cell walls and then
emerge as swimming
zoospores from the wall
of the parent cell that
had enclosed them.
Asexual
Reproduction
A mature cell of Chlamydomonas
is a haploid
It resorbs its flagella and then divides twice
by mitosis, forming four cells (more in
some species)

6. Sexual Reproduction MEIOSIS MITOSIS When the zygote breaks dormancy,
Meiosis produces four haploid
Individuals (two of each mating type)
That emerges from the coat.
They eventually grow into mature cells.
MEIOSIS
A mature cell of
Chlamydomonas is a
Haploid cell.
This diploid zygote
secretes a durable
coat that protects
the cell against
harsh conditions
Sexual
Reproduction
MITOSIS
Fusion of the
isogametes occurs slowly,
forming a diploid zygote.
After their release, gametes from
opposite mating types (designated
+ and - ) pair off and cling together.
Within the wall of the parent cell,
mitosis produces many haploid
Gametes.

8. Some added notes: ISOGAMY –literally means “a marriage of equals”
SPOROPHYTE –diploid individual that produce individual cells called spores (zoospores)
GAMETOPHYTE –haploid individual that produces gametes
HETEROMORPHIC Generations
–sporophytes and gametophytes are structurally different
ISOMORPHIC Generations
–sporophytes and gametophytes look alike, although they are different in chromosome number.