Genetics

April 21, 2010 at 1:13 am #13164

jdg1971

Participant

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?

April 22, 2010 at 3:34 pm #99214

simpleton

Participant

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.

April 22, 2010 at 7:09 pm #99224

JackBean

Participant

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.

April 23, 2010 at 9:15 am #99246

simpleton

Participant

opps, wrong use of term. 😀 thanks for correcting!

April 24, 2010 at 10:56 am #99285

jwalin

Participant

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.

April 27, 2010 at 10:46 am #99370

simpleton

Participant

haha! let’s call it anyhow-cross!!

biology has got so many terms!!

April 27, 2010 at 11:01 am #99373

JackBean

Participant

😆

April 28, 2010 at 12:17 pm #99416

jwalin

Participant