mendelian laws

Genetics as it applies to evolution, molecular biology, and medical aspects.

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emilyallison
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Post by emilyallison » Thu Nov 17, 2005 6:06 am

Gregor crossed a true breeding yellow, rough pea plant with a true breeding green, smooth plant. All of the off-spring were green, rough plants. He then used these F1 plants for back crosses to each parent. What are the genotypes and phenotypes of the offspring of these two back crosses?

This is one of the questions that was assigned that I'm unsure of. I don't even really know where to start with it. I'm a business major so I'm kind of lost when it comes to this kind of stuff. :-(

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mith
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Post by mith » Thu Nov 17, 2005 9:30 pm

think of it as multiplication, first list the alleles then FOIL them out...
Living one day at a time;
Enjoying one moment at a time;
Accepting hardships as the pathway to peace;
~Niebuhr

emilyallison
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Post by emilyallison » Fri Nov 18, 2005 2:48 am

FOIL them....? :oops:

Terry K.
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Post by Terry K. » Wed Nov 30, 2005 1:11 am

I don't know what he means either because FOIL pertains to math where you have an equation like x^2+x+1, and then you factor it out to (x+1)(x+1), or (x+1)^2, then you FOIL it, which is simply multiplying firsts, outers, inners, lasts, so you would multiply the Xs, then x times 1, then the other x times the other 1, then multiply the ones, and you would end up with the orginal example. I don't know how that applies to here though?.
Saying that any two humans are exactly alike is like saying republicans have morals

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mith
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Post by mith » Wed Nov 30, 2005 2:05 am

well these are basically look like multiplication when you make the squares

(x+y)(x+y) = xx +2xy + yy
Living one day at a time;
Enjoying one moment at a time;
Accepting hardships as the pathway to peace;
~Niebuhr

Terry K.
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Post by Terry K. » Wed Nov 30, 2005 2:43 pm

oh, ok, I see where you are coming from now, I was worried about you there for a bit :? Gotcha now though.
Saying that any two humans are exactly alike is like saying republicans have morals

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