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Reproduction - 1.9 The Best of Both Worlds - Reproduction in Fungi | OBA School UK | YouTubeToText
YouTube Transcript: Reproduction - 1.9 The Best of Both Worlds - Reproduction in Fungi
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Core Theme
Fungi primarily reproduce asexually through mitosis, producing genetically identical spores for stable conditions. However, they switch to sexual reproduction via meiosis when conditions become unfavorable, generating genetically diverse spores to enhance survival and adaptation.
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reproduction and fungi
the most common form of reproduction in
fungi is asexual reproduction
the parts you most commonly see such as
toadstools and puffballs are asexual
fruiting bodies full of spores
the molds that rot our food
also reproduce asexually
many fungi are made up of a mass of thin
threads called hyphae that together form
the structures that we can see
in asexual reproduction the fungal spores
spores
are produced by mitosis and they are
genetically identical to the parent
if you want to understand spores think
of seeds in plants
some fungi
also reproduce sexually when the
conditions are not good
for example when it's dry
too high fee from different fungi join
and the nuclei fuse
so the new hypha has two sets of chromosomes
chromosomes
so it goes from the haploid state hyphae
are haploid they have n chromosomes
and their nuclei fuse so now we have two
n chromosomes we are in the diploid state
state
it undergoes meiosis to make haploid spores
spores
each with only one set of chromosomes so
n chromosomes
so we had the high feet joining together
going from
n chromosomes to 2n chromosomes
then undergoing meiosis to produce
daughter cells or spores that have n
chromosomes so haploid again
the chromosomes of hyphae are different
from the original hyphae different from
the parent hyphae that fused together to
make the diploid that underwent meiosis
and this is the variation that we talked
about in sexual reproduction
some spores may produce fungi that are
better adapted to survive the adverse
conditions and this is why
sexual reproduction and fungi happens
when the conditions are unfavorable
in order to play the game of chance
to see if the fungus can produce
offspring that are better adapted to the
new environment to the new conditions of
its environment
otherwise if the conditions are
favorable and stable
the fungus will undergo asexual reproduction
we have spores
spores
being produced
by mitosis asexually as long as the
conditions are favorable
the spores become hyphy and then the
hyphae makes pores
by mitosis
here they are in the haploid state with
n chromosomes
the spores will germinate
to form a new fungus the new fungus has
hyphae each hypha which is the singular
of hyphae
can produce spores
through mitosis
now the second the conditions become unfavorable
unfavorable
then too hyphy will join together will
fuse to make a zygote
a diploid
hypha with two n chromosomes it will
undergo meiosis
to form
the haploid spores now what is the
difference between these pores produced
by sexual reproduction and the spores
produced by asexual reproduction
they are both haploid with n chromosomes
however the spores produced by asexual
reproduction have the exact same genes
as the parent they are identical
the spores produced by sexual
reproduction are different from each
other and from the parent there is
variation here
these spores will then germinate into a
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