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Comment by Mattia Rossi on April 30, 2013 at 11:39am

Hi Hedi,

...fresh data of today …

Comment by Mattia Rossi on April 28, 2013 at 11:11am

As you said our set up allow to move individuals.

They measured plants on day 4, 8, 15 and 21 after planting (consider that we are 10 day slower than you…I wanted to slow down the growth because of a lack of science lessons during the week). 

Heights are measured like this:

In our selection at the moment there are no differences between offspring  (F2) and the first population (F1) from which we selected their parents.

Ciao, ciao.

Comment by Hedi Baxter Lauffer on April 28, 2013 at 8:56am

Great to see these data, Mattia; thank you for posting. It sounds like the growing set up that you have allows every individual plant to be moved, so that you were able to physically separate the shortest and tallest plants. That makes conducting the selection experiment for two traits (short and tall) much more manageable than the situation many teachers have where their students are growing Fast Plants in quads (so four plants are necessarily grouped together randomly).

I'm curious on what day your students measured the height and how you defined what they would consider the "top" of the plant?

I am also looking forward to seeing your data for the offspring from each of the parent groups. It looks like you and your students are doing some thoughtful work here! Thanks again for sharing.

Comment by Mattia Rossi on April 27, 2013 at 6:32am

Hi Hedi,

Here some statistical data (in Italian) about the first population, from which we selected  “the shortest”.

We simply separated the 10 “shortest” and the 10 “highest” from the entire population when the plants began to flower. Afterwards a piece of Plexiglas was placed in the middle in order to separate groups physically.

I decided to live with the risk of bias do to the bolting process, even though I was warned against that from the artificial selection group on the network.

I thought that for my young students it was better to simplify the experimental design …..

Comment by Hedi Baxter Lauffer on April 19, 2013 at 8:07am

Interesting. We'll be really interested to learn about the heights of the offspring from the shortest parents.

Did you cut down the mid-range height plants when you made your selection? I'm also curious: how did you separate the shortest and tallest portions of the populations during pollination?

Thank you so much for sharing such great documentation of your work in progress!

Comment by Mattia Rossi on April 18, 2013 at 2:38pm

Hi Hedi,

the 10 shortest produced 1143 seeds,

the 10 tallest more than 3000.

We decided last tuesday to plant the seeds from the shortest...work in progress...

Comment by Hedi Baxter Lauffer on April 17, 2013 at 1:10pm

Looks like great seed production. When will your students plant the next generation?



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