Mendelian Genetics

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

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Di
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Mendelian Genetics

Post by Di » Sat Nov 11, 2006 9:43 am

What do upper and lower case letters represent in Mendelian genetics?
i need this answer by Tuesday... Thank you!

sdekivit
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Post by sdekivit » Sat Nov 11, 2006 10:37 am

dominance and recessive

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sachin
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Post by sachin » Sat Nov 11, 2006 4:29 pm

sdekivit wrote:dominance and recessive


Upper for Dominanat Allele And Lower for Recessive.

eg. T--tallness , t ---- dwarfness.

This marking method used as this is more simple.
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Mr Joe
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Post by Mr Joe » Thu Nov 16, 2006 11:13 pm

T = Dominant
t = Recessive

like he said T= tall t= short
just as an example of course

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Post by Azedenkae » Sat Nov 18, 2006 1:26 pm

Yes, and the letters can stand for anything (I think) although most of the time the letter used is the first letter of the dominant.

So tall/dwarf is T/t

yellow seed colour/green seed colour is Y/y

round/wrinkled is R/r

Axial/terminal is A/a

(This is for the pea plants in Mendel's experiment.)

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Post by MrMistery » Sat Nov 18, 2006 6:46 pm

sometimes they do not stand for anything. in population biology i've seen frecquent use of X1X1, X1x1 and x1x1. and at a statistics class a professor was doing a cross between 7 characters(no, not with a punnet square) and was using x1,x2,x3..x7(as recessive)
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Post by sdekivit » Sat Nov 18, 2006 7:47 pm

it doesn't matter what letter you give a trait, if you clarify what your letters mean.

--> i can use x and X when i specify X = tall en x = dwarf. But someone else could use Y and y for the same trait.

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Post by MrMistery » Sun Nov 19, 2006 11:59 am

my point exactly.
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