Fungi Reproduction - Chapman @ Norquay School
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Transcript Fungi Reproduction - Chapman @ Norquay School
Mr. Chapman
Biology 20
Fungi Have a Number of
Reproductive Strategies
Depending on the favorability of conditions,
fungi will reproduce either sexually or
asexually.
During favourable conditions, fungi reproduce
asexually. During non-favourable conditions,
fungi will lean towards sexual reproduction.
We will focus on two main groups (phyla) of
fungi and their life cycles: Club Fungi and
Bread Molds.
Something to Think About...
A Quick Note: Single-Celled Fungi
Single-celled fungi, including some yeasts,
reproduce sexually and asexually. There are
two forms of asexual reproduction for
single-celled fungi: Fission and Budding
Yeah, we’ve all seen them... But have you eaten them?
Characteristics of Bread Molds
Form the molds you see on old, spoiled foods,
such as the sandwiches I used to leave in my
locker for months.
Members of the phylum get food by
decomposing dead or decaying matter.
Asexual reproduction performed by spore
production. Recall that spores are haploid (1n)
gametes.
Reproduction in Bread Molds
Asexual Bread Mold Reproduction
The sporangium bursts and releases spores
(1n) to the surface that the mold is growing on.
The spore produces hyphae (1n) under the
surface of the bread, which develops into a
network of mycelia (1n).
Some hyphae (1n) grow above ground, and
produce new sporangia that eventually release
spores.
Sexual Reproduction of Bread Molds
Gametes (1n) of different mating types form at the
tip of hyphae that are very close to each other
under the surface.
The gametes fuse, forming a diploid zygospore
(2n). This zygospore has a tough, thick outer layer,
and can remain dormant for an extremely long
time.
Later on, the zygote (2n) can produce a
sporangium (1n) by meiosis, which grows into a
new spore producing structure.
These ones, you’ve actually probably eaten...
Characteristics of Club Fungi
Named for their club-shaped reproductive
structures, called basidia, which are found
on the undersides of mushrooms.
Some groups of these fungi cause diseases
in plants.
Club fungi only reproduce sexually.
Reproduction in Club Fungi
Sexual Reproduction in Club Fungi
Haploid nuclei (1n) within the basidia fuse to form diploid
(2n) zygotes.
Zygotes (2n) then undergo meiosis to form haploid
spores (1n), which are then released and dispersed by
the wind.
Upon contact with the ground, the spores grow into
hyphae of opposite mating types, fusing to form a diploid
(2n) mycelium underground.
The mycelium grows a new fruiting body (the
mushroom), and the cycle repeats itself.