Biology Forum Genetics Genetics

4 voices
11 replies
  • Author
    Posts
    • #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?

    • #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.

    • #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.

    • #99246
      simpleton
      Participant

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

    • #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.

    • #99370
      simpleton
      Participant

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

      biology has got so many terms!!

    • #99373
      JackBean
      Participant

      😆

    • #99416
      jwalin
      Participant

      lol
      thats a nice way to go about thing
      simplifying them 😉
      simpleton indeed 😆 😉

    • #99495
      simpleton
      Participant

      hey jwalin,i chanced upon the correct term for F1/F1. it’s called intercross. 🙂

    • #99499
      JackBean
      Participant

      maybe it’s name for any croos between organisms with the same genome 😉

    • #99500
      simpleton
      Participant

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

    • #99501
      JackBean
      Participant

      well, that’s something different from what I wrote… but makes sense…

You must be logged in to reply to this topic.

Members