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Genetics

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

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Genetics

Postby 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?
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Postby 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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Postby 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.
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Postby simpleton » Fri Apr 23, 2010 9:15 am

opps, wrong use of term. :D thanks for correcting!
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Postby 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.
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Postby 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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Postby JackBean » Tue Apr 27, 2010 11:01 am

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

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Postby jwalin » Wed Apr 28, 2010 12:17 pm

lol
thats a nice way to go about thing
simplifying them ;)
simpleton indeed :lol: ;)
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Postby 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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Postby JackBean » Sat May 01, 2010 9:11 am

maybe it's name for any croos between organisms with the same genome ;)
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Postby 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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Postby 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/

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