Answer:
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Explanation:
3
Weed Reproduction
Weeds most often reproduce by seed.
Some weeds reproduce through vegetative means.
new individuals formed from multicellular structures of a single
plant.
vegetative reproduction is a trait that is shared by 60% of the
world’s worst weeds.
reproduction by vegetative methods makes weed control
extremely difficult.
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Weed Reproduction
An understanding of a weed’s breeding system, methods of
propagule dispersal, and life form is important.
These attributes can be used to predict population spread and
longevity.
They can also be used to predict genetic diversity within and
among populations.
The more genetically diverse a population:
the more it is buffered from management strategies
more likely that individuals are present that can adapt to the
strategy.
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Outcrossing in Weeds
The gametes that form the zygote are genetically dissimilar.
Self-incompatibility may be involved.
Outcrossing may occur between closely related individuals.
Inbreeding depression
Leads to more diversity within a population.
Leads to less diversity among populations.
Populations from different geographies are not very specialized.
At low densities there may not be enough pollen to produce the full
potential of seed.
If the species is an obligate outcrosser, at least two plants are
required to start a new population.
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Self-pollination in Weeds
The gametes that form the zygote are genetically very similar.
Leads to less diversity within a population.
A population can be relatively homozygous.
Leads to more diversity among populations
Populations from different geographies can be very specialized.
If the species can self pollinate, only one plant is required to start a
new population.
