Epigenetics of Reproduction in Animals - Building the Most Complex Structure on Earth - page 93

a

1

a

Haploid

3

a

a

α

α

a\ α

2

Diploid

α

Haploid

1

1

α

Figure 2.21 The life cycle of a yeast cell. This diagram shows budding in 1, conjugation in
2, and spore in 3.
Source : From Developmental Biology Interactive , http://www.devbio.biology.gatech.
edu/?page_id=1226 .

Sexual reproduction

New
colony

Entrance of the
antherozoid

Egg Zygote Single zoospore

Oosphere
Oogonium

Crampon

Zoospore Liberation

of the spores

Antheridium
Antherozoid
Pyrenoid
Crampon

Asexual reproduction

New
colony

www.infovisual.info

Zoosporangium Zoospore

Figure 2.22 Sexual and asexual reproduction of green algae.
Source : From The Visual Dictionary , http://www.infovisual.info/01/022_en.html .

the well-known Volvox. The typical green alga has chloroplasts, central vacuole, and
cellulose cell walls.

Asexual Reproduction in Green Algae

Asexual reproduction in green algae occurs in the form of fission or budding or by
the production of zoospores in the zoosporangium. Asexual zoospores swim and
form new colonies ( Figure 2.22 ).