Wednesday, March 30, 2011

March 30

Today, Mr. Finley had us try to figure out what he wanted us to figure out why he asked us the homework questions after we went over it. We thought it was because some genes were recessive, as in they were in our parents but maybe didn't show up in them. Then they got passed down to us and we showed them. Mr. Finley asked the class who could make their tongue into a U, and almost everybody could. Then Mr. Finley said that we weren't exactly understanding the ideas of dominant and recessive genes, and he told us we would look at the pes again. We had to try to figure out the hypothesis that would allow us to predict the genetic combinations the children would have. Our hypothesis was that: To find the combinations of genes in the children, you need to combine the first gene with both genes in the second pea's genes.


  1. When my group and I combinded a smooth yellow pea as a parent and a rough green pea as a parent the kids turned out all rough and yellow. I think that happened because of genetics. One pea was smooth and yellow, and another was green and rough, so there is a likely chance of the kids having a trait from their parents.

  2. What would happen with this concept if all the letters were capitilzed(YY and RR)? I am Kind of confused about this concept.
    Carter Stumpf

  3. I agree with Simrin because my old group, before we changed seats, agreed that if we combined 2 peas that have different colors and different textures, 50% will be green, 50% will be yellow, and out of the 4 different colored peas 50% will have wrinkles, and lastly 50% will be smooth.

    kATIE goMEZ 8D

  4. What our qroup came up with was, that a capital Y meant that the pea was yellow and a capital R meant that the pea would be smooth. Therefore a lower case r meant the pea was wrinkled and the lower case y meant the pea was green. Keeping that in mind, we also found out that the secret or method behind predicting the childrens' characteristics, you had to look at all the letters under each pea parent. For example if one parent was Yy and rr-other parent was YY and Rr, then the children would be YY/rR, YY/rr, yY/rR, and yY/rr. You might wonder how we i did this. Well all you do is distrubute the y's to each of the others between the two parents, and do the same for the r's(called distrubutive property). Then once you distrubute, you can predict the appearence of the children based on the results, by aplying the rules from above(Capital Y=yellow..ect)

    That was our model and method to predict the children

    ---Saad K.

  5. sorry, my model is the same as Rohan's because when i started creating my comment, his comment wasn't up there, so i made my own. By the time i posted mine he already put one. So, please don't think i copied his.


  6. Sorry guys, but Lloyd was not able to finish this blog due to his religious school, thus, I will tell you his idea, since we both have the same idea. Comment on this blog only!

    Here it is:

    Say the parents had the genes Yy:RR and yy:rR. The colon represents that they are stacked.
    Let us say that each staked letter is a part of the chromosome. What do I mean by that? I mean that Y:R from the chromosome Yy:RR is part of this
    chromosome. You guys should have learned the distributive property by now in math. If not, look it up online. We are going to distribute, or multiply, the Y:R to each of the stacked terms
    in the other chromosome only (in this case it is yy:rR). Y:R "times" y:r is Yy:Rr. Now, we distribute.
    "Multiply" the Y:R to the other stacked term, y:r. The"product"
    is Yy:RR. Now that we are done with the first
    stacked term from the Yy:RR chromosome, we must now
    now deal with the second term, which is y:R. y:R
    "times" y:r is yy:Rr. y:R "times" y:R is yy:RR. Now, we have
    the new chromosomes for the children, which are
    Yy:Rr, Yy:RR, yy:Rr, and yy:RR. Now that we know what the
    new chromosomes are, we now need to know what the colors and textures are of the new peas. If the new chromosome has a Y in it, it will be yellow. If it doesn't and it has a yy, than it is green. If the chromosome has a R in it, the pea will be smooth. If it doesn't and it has rr, it will be wrinkly.

    I hope you understand how to do it now. If you don't, either go to Finley or me for help.

    Rohan Mallya

    P.S. My first comment was messed up.

  7. For Carter:

    If all the letters were capatilized, then thepea would be yellow and smooth. At least one of the letters has to be Y for it to be yellow, and at least one has to be R for it to be smooth. Read my new and upadated comment for answers. My first one was messed up.


  8. If there are two lower case Y's would it be green? Or when would it be? I dont get the color thing. How do you know what color it would be?

  9. I think when it's YY it green and smooth, when it RR it's yellow and smooth, when it is yy its green and rough and when it is rr I think it yellow and rough. But is it possible for it to be Yy or Ry.. i am kinda confused

    ~Rachel Rillo

  10. If there is at least 1 capital Y, it will be yellow. It can only be green if it is "yy" to answer Talya's question. For the texture, it was to be "rr" to be wrinkled.

    -Noah Kudman

  11. So, technically, the "y"s determine color and the "r"s determine texture.

    -Noah Kudman

  12. I believe Noah is correct: Since he is true, does this mean that there is a 3/4 chance that it will be yellow? I think this seems unlikely. I get that if you had a bag with 3 yellow marbles and 1 green marble there would be a 3/4 chance of getting yellow, but with parents and genes and stuff, is there a way of determining if the child will be green. I think there is but it would always change depending on the parents.

    In other words can you create a way, for humans especially, of knowing before the baby is born based on probability, without performing a scan, that can determine if the child will be male or female or have blue eyes or brown eyes etc. just by looking at chromosomes and the parents genes??? Now I know, that it would be very hard to get every characteristic right, but is there a way? Keep in mind these questions imply your only having one child.

  13. I do agree with Rohan, but still have a question. In my opinion, it seems to straight forward for nature. I mean, it seems like, to me that in nature everything is more complicated than just, as this experiment was, just multiplying (basically) the different letters.

    So, I ask everyone out there, is this how it really works in nature, why, and lastly, what do the letters mean in the pea thing????

  14. When there is one capital Y, the color will be yellow. But if there are two lowercase y's then the color will be green. But, I agree with Noah that the r's do determine the texture. I also think that 50% of the DNA from the parents, the kids have too!

    ~Erica Wirth~

  15. Hey guys, it's Lloyd, sorry I had religious school. Didn't really want to be there either :(

    So anyway, for those of you in regular math I'm going to make a pathetic attempt to describe the distributive property used in the model.

    Basically you need to think of the problem as two different problems. Say you have this combination of parents:

    Yy yy
    rR Rr

    First, we take the y/Y's. Take the first half of the first parent's y/Y combination, which is Y. Then we have to combine that with both parts of the second parent's y/Y combination, which is yy. So we combine Y and y to get Yy, and Y and y to get Yy. Now we repeat the process with the second half of the first parent's y/Y combination; y. So y and y is yy, and y and y is yy. So the four y/Y combinations of the children will be Yy, Yy, yy, and yy.

    Now we do the same things with the r/R's. We
    take the first half of the first parent's r/R combination; r. Then we do r+R=rR, and r+r=r. We then repeat with the R, and we get R+R=RR, and R+r=Rr. So the four r/R combinations of the children will be rR, rr, RR, and Rr. So the children will look like this in total:

    Yy Yy yy yy
    rR rr RR Rr

    We can then use the formula described above to figure out what the children look like.

    Hope this helped!

  16. Kevin explained this to our group today, you distribute the first "y" or "Y" to another pea then repeat for the other"y"s and same for the r's. Two r's means it would be wrinkled. Two y's means it would be green and with at least one Y you get a yellow pea. At least one R means it will be smooth.

  17. The "r"s determined the texture! and the "y"s create the color!

    Maddie B

  18. Good question, I have no clue.