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Set 7: Chromosomes Part II Euploidy, Monoploidy, Triploidy, Tetraploidy

Course Code
Christine Dupont

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Jan 31, 2011
Euploids: gain or lose entire sets of chromosomes
Ie. Humans are euploid species because we’re diploid
Polyploids: euploids that carry three or more complete sets of
Eg triploids, tetraploids
Monoploids: one complete set of chromosomes (usually
infertile because can’t go through meiosis
To make a monoploid does not involve fertilization. Females go
through parthenogenesis: embryo develops from unfertilized
Eg. Sterile male worker bees
Triplods are the result of mating diploids with tetraploids
Triploid plants are viable but sterile (ie. No seeds)
- not fertile because during meiosis, you end up with
gametes that are random variations of aneuploidy
Creation and Use of Monoploid Plants:
convert from diploid to monoploid then back again
- If diploid is carrying a useful recessive allele, one can
create a monoploid and see the desired phenotype
- Treat pollen of diploid to cold shock give nutrients and
growth hormones, it will develop into monoploid plant
- clone plants by putting cells of monoploid in nutrients
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