how can you identify the genotypes?

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michellemaria
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how can you identify the genotypes?

Post by michellemaria » Sun Oct 23, 2005 7:16 pm

Hey i was just wondering how can you identiry the genotypes of a family member if you know their phenotype? :?
Thanks :oops:

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MrMistery
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Post by MrMistery » Mon Oct 24, 2005 6:36 pm

It depends on the trait. Generally, you can't
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zami'87.
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Re: how can you identify the genotypes?

Post by zami'87. » Tue Oct 25, 2005 9:12 pm

Use family tree and must know how the trait is inherited(recessive,dominant, also is it X-linked or on autosome or on mitochondrial DNA).
Anyway draw family tree and even then it’s just a guess-high possibility.
But IF molecular basis is known then u can use some techiniques for DNA analysis like RFLP(restriction fragment length polymorphism). So normal individual has specific pattern of bands and heterozyggous has mixed normal pattern and mutant patern
And heh in Drosophila test cross is used(breeding with recessive parent).

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Post by baikuza » Wed Oct 26, 2005 4:27 am

hei.. how about genetic test?
already try this? :wink:

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victor
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Post by victor » Wed Oct 26, 2005 1:02 pm

Just do a testcross and backcross..... :lol:
Actually, you can do what Mithril suggest...um by the way Baikuza, do you know how to do a genetic test? :?
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Post by Terry K. » Wed Oct 26, 2005 2:24 pm

I think just a basic family genetic history could narrow it down, and when you have kids, you will know for sure, for the most part, unless you have a dominant and recessive gene for a trait, and you only have kids with your dominant, then basically, your up the creek w/o a paddle
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baikuza
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Post by baikuza » Thu Oct 27, 2005 1:27 pm

hei.. are human can do testcross???
i think it is to.. HARD to DO...
i can not imagine it....

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mith
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Post by mith » Fri Oct 28, 2005 2:30 pm

it would be much easier and more conclusive to test the DNA, besides I don't think test crosses for humans are ethical :roll:
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canalon
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Post by canalon » Fri Oct 28, 2005 3:34 pm

mithrilhack wrote:it would be much easier and more conclusive to test the DNA, besides I don't think test crosses for humans are ethical :roll:


To say anythhing about practical (where would you find pure lines, and think generation time...) :wink:

Yet DNA testing is not alway easy because before testing you should know *what* you want to test for...
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