you simply MUST watch "Botany of Desire". It shows the ancestors of 4 species
where
humans have had a hand in extensive selection pressure. I use this movie in my
class.
Featured plants:
Apples
Tulips
Potatoes
Marijuana
Scroll to the bottom of my site here
http://weloveteaching.com/arsc11/genetics/mendeliangenetics.html
I just love how Brassica oleracea has undergone selection!!!
Ingrid
>Nelly wrote:
>>> When should I begin haunting the Farmer's market for fabulous locally
>>> grown sweet
>>> corn? INgrid
>>> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>> Somewhere between zone 5 and 6 tucked along the shore of Lake
>>> Michigan on the council grounds of the Fox, Mascouten, Potawatomi,
>>> and Winnebago
>>
>> Most of the sites just generally say "August". This might get you in
>> contact with a local with hopefully less vague info:
>> http://www.pickyourown.org/WI.htm
>>
>> Not to stire up the thread-drift police, but has anyone ever seen the
>> ancestral plant corn came from? Genetic engineering over the millenia
>> sometimes amazes me.
>Are mutation and human selection genetic engineering?
>Many of our food plants (and animals) have been through such extreme change
>due to such processes since mankind started agriculture - some say back into
>our hunter-gatherer days. The ancestors of many plants had much smaller
>edible parts, were less tasty (in some cases they were poisonous) and did
>not grow so much in ways that suit cultivation.
>David
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Somewhere between zone 5 and 6 tucked along the shore of Lake Michigan
on the council grounds of the Fox, Mascouten, Potawatomi, and Winnebago
dr-solo@wi.rr.com wrote:
> you simply MUST watch "Botany of Desire". It shows the ancestors of
> 4 species where humans have had a hand in extensive selection
> pressure. I use this movie in my class.
> Featured plants:
> Apples
> Tulips
> Potatoes
> Marijuana
> Scroll to the bottom of my site here
> http://weloveteaching.com/arsc11/genetics/mendeliangenetics.html
> I just love how Brassica oleracea has undergone selection!!!
> Ingrid
Good stuff. Even if you don't into the details of what they are I think it
would be good to mention that Mendelian genetics is only part of the story
and there are many additional processes that interfere with strict Mendelian
outcomes.
Secondly the breeding of domesticated species was mainly conducted before
Mendel (or Darwin who didn't know about Mendel either) so it was a matter of
selection of desired traits and hoping for the best rather than
understanding how it worked. Even today some domestic breeding does rely on
understanding the genetics (eg colour-pointed cats) but much does not (eg
cattlemen pick "good" bulls on phenotype and ancestry knowing little or
nothing about their actual genotype).
David
> dr-solo@wi.rr.com wrote:
> > you simply MUST watch "Botany of Desire". It shows the ancestors of
> > 4 species where humans have had a hand in extensive selection
> > pressure. I use this movie in my class.
> > Featured plants:
> > Apples
> > Tulips
> > Potatoes
> > Marijuana
> >
> > Scroll to the bottom of my site here
> > http://weloveteaching.com/arsc11/genetics/mendeliangenetics.html
> > I just love how Brassica oleracea has undergone selection!!!
> >
> > Ingrid
> >
>
> Good stuff. Even if you don't into the details of what they are I think it
> would be good to mention that Mendelian genetics is only part of the story
> and there are many additional processes that interfere with strict Mendelian
> outcomes.
>
> Secondly the breeding of domesticated species was mainly conducted before
> Mendel (or Darwin who didn't know about Mendel either) so it was a matter of
> selection of desired traits and hoping for the best rather than
> understanding how it worked. Even today some domestic breeding does rely on
> understanding the genetics (eg colour-pointed cats) but much does not (eg
> cattlemen pick "good" bulls on phenotype and ancestry knowing little or
> nothing about their actual genotype).
>
> David
Wheat genetics is more complicated than that of most other domesticated
species. Some wheat species are diploid, with two sets of chromosomes,
but many are stable polyploids, with four sets of chromosomes
(tetraploid) or six (hexaploid).[18]
€ Einkorn wheat (T. monococcum) is diploid (AA, two complements of
seven chromosomes, 2n).[1]
€ Most tetraploid wheats (e.g. emmer and durum wheat) are derived
from wild emmer, T. dicoccoides. Wild emmer is itself the result of a
hybridization between two diploid wild grasses, T. urartu and a wild
goatgrass such as Aegilops searsii or Ae. speltoides. The unknown grass
has never been identified among now surviving wild grasses, but the
closest living relative is Aegilops speltoides.[citation needed] The
hybridization that formed wild emmer occurred in the wild, long before
domestication.[18]The hybridization that formed wild emmer (AABB)
happened long before domestication, and was driven by natural selection.
€ Hexaploid wheats evolved in farmers' fields. Either domesticated
emmer or durum wheat hybridized with yet another wild diploid grass
(Aegilops cylindrica) to make the hexaploid wheats, spelt wheat and
bread wheat.[18] These have three sets of paired chromosomes, three
times as many as in diploid wheat.
The presence of certain versions of wheat genes has been important for
crop yields. Apart from mutant versions of genes selected in antiquity
during domestication, there has been more recent deliberate selection of
alleles that affect growth characteristics. Genes for the 'dwarfing'
trait, first used by Japanese wheat breeders to produce short-stalked
wheat, have had a huge effect on wheat yields world-wide, and were major
factors in the success of the Green revolution in Mexico and Asia.
Dwarfing genes enable the carbon that is fixed in the plant during
photosynthesis to be diverted towards seed production, and they also
help prevent the problem of lodging. 'Lodging' occurs when a ear stalk
falls over in the wind and rots on the ground, and heavy nitrogenous
fertilization of wheat makes the grass grow taller and become more
susceptible to this problem. By 1997, 81% of the developing world's
wheat acreage was planted to semi-dwarf wheats, giving both increased
yields and better response to nitrogenous fertilizer.
Wild grasses in the genus Triticum and related genera, and grasses such
as rye have been a source of many disease-resistance traits for
cultivated wheat breeding since the 1930s.
<http://en.wikipedia.org/wiki/Wheat>
It got complicated before Mendel.
Dance ;O)
--
- Billy
"Fascism should more properly be called corporatism because it is the
merger of state and corporate power." - Benito Mussolini.
http://www.democracynow.org/2010/7/2/maude
http://www.democracynow.org/2010/6/28/naomi_klein_the_real_crime_scene
oh yeah, Mendelian is just the starting point. even tho this is a course for
non-science majors I take them thru as much micro level as I think they can
handle.
my minor is molecular genetics so I do try to hold back a bit. I do not go so
far as
discussing transposons tho. it would really be over their head.
Ingrid
>Good stuff. Even if you don't into the details of what they are I think it
>would be good to mention that Mendelian genetics is only part of the story
>and there are many additional processes that interfere with strict Mendelian
>outcomes.
>Secondly the breeding of domesticated species was mainly conducted before
>Mendel (or Darwin who didn't know about Mendel either) so it was a matter of
>selection of desired traits and hoping for the best rather than
>understanding how it worked. Even today some domestic breeding does rely on
>understanding the genetics (eg colour-pointed cats) but much does not (eg
>cattlemen pick "good" bulls on phenotype and ancestry knowing little or
>nothing about their actual genotype).
>David
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Somewhere between zone 5 and 6 tucked along the shore of Lake Michigan
on the council grounds of the Fox, Mascouten, Potawatomi, and Winnebago
XML site map
>>> When should I begin haunting the Farmer's market for fabulous locally
>>> grown sweet
>>> corn? INgrid
>>> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>> Somewhere between zone 5 and 6 tucked along the shore of Lake
>>> Michigan on the council grounds of the Fox, Mascouten, Potawatomi,
>>> and Winnebago
>>
>> Most of the sites just generally say "August". This might get you in
>> contact with a local with hopefully less vague info:
>> http://www.pickyourown.org/WI.htm
>>
>> Not to stire up the thread-drift police, but has anyone ever seen the
>> ancestral plant corn came from? Genetic engineering over the millenia
>> sometimes amazes me.
>Are mutation and human selection genetic engineering?
>Many of our food plants (and animals) have been through such extreme change
>due to such processes since mankind started agriculture - some say back into
>our hunter-gatherer days. The ancestors of many plants had much smaller
>edible parts, were less tasty (in some cases they were poisonous) and did
>not grow so much in ways that suit cultivation.
>David