Genetics

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

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jdg1971
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Genetics

Post by jdg1971 » Wed Apr 21, 2010 1:13 am

In rabbits, black hair is dominant (B) over brown hair(b). Short hair is dominant(S) over short hair (s). What is the F1 Phenotypic ratio from a cross with a homozygous black long hair rabbit to a brown homozygous short? What is the F2 ratio?

simpleton
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Post by simpleton » Thu Apr 22, 2010 3:34 pm

you mean short hair is dominant over long hair?

F1 will all be BbSs because BBss x bbSS

F2; you mean backcrossing F1?
If it is, BbSs x BbSs; you get 4 kinds of combination for the gametes, BS, Bs, bS and bs.. just do a dihybrid cross and you can get the answer.

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JackBean
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Post by JackBean » Thu Apr 22, 2010 7:09 pm

what you wrote is not backcrossing, that would be BbSs x BBss and BbSs x bbSS ;)
but I think s/he wanted the cross you wrote.
http://www.biolib.cz/en/main/

Cis or trans? That's what matters.

simpleton
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Post by simpleton » Fri Apr 23, 2010 9:15 am

opps, wrong use of term. :D thanks for correcting!

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jwalin
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Post by jwalin » Sat Apr 24, 2010 10:56 am

lol
btw way what is such a cross called...
had it been in plants we refer to it as self pollinated plants but again i think that ainnt the right term for such crosses thats just refering to plant being pollinated by itself but not by even those other plats that have the same genotype atleast for the characteristic under consideration.
it isn't what you do that matters but it is how you do it

simpleton
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Post by simpleton » Tue Apr 27, 2010 10:46 am

haha! let's call it anyhow-cross!!

biology has got so many terms!!

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JackBean
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Post by JackBean » Tue Apr 27, 2010 11:01 am

:lol:
http://www.biolib.cz/en/main/

Cis or trans? That's what matters.

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jwalin
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Post by jwalin » Wed Apr 28, 2010 12:17 pm

lol
thats a nice way to go about thing
simplifying them ;)
simpleton indeed :lol: ;)
it isn't what you do that matters but it is how you do it

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Post by simpleton » Sat May 01, 2010 4:27 am

hey jwalin,i chanced upon the correct term for F1/F1. it's called intercross. :)

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JackBean
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Post by JackBean » Sat May 01, 2010 9:11 am

maybe it's name for any croos between organisms with the same genome ;)
http://www.biolib.cz/en/main/

Cis or trans? That's what matters.

simpleton
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Post by simpleton » Sat May 01, 2010 12:17 pm

cause according to "Principles of genetics", it says it is the cross between individuals of same ancestry. :D

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JackBean
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Post by JackBean » Sat May 01, 2010 12:32 pm

well, that's something different from what I wrote... but makes sense...
http://www.biolib.cz/en/main/

Cis or trans? That's what matters.

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