Category: Science > Biology
Asked by: jennifer1000-ga
List Price: $2.00
06 Oct 2004 12:12 PDT
Expires: 05 Nov 2004 11:12 PST
Question ID: 411147
In four O'clock flowers, red is incompletely dominant over white giving you a passionate pink flower. However, a straight stem is completely dominant over a curved stem. If a pink flower that is heterozygous for a straight stem is corssed with a white, curved flower, what would be the chances of geting a white straight flower?
Re: genetic formula
Answered By: librariankt-ga on 07 Oct 2004 07:27 PDT
Hi Jennifer, This question is similar to the roan horses one from before, since it deals with incomplete dominance. Color: R vs. r (RR=red, Rr=pink, rr=white) Stem: S vs. s (SS or Ss=straight, ss=curved) Parents: RrSs and rrss Now we do our cross: RrSs (pink, straight) : 1 Rrss (pink, curved) : 1 rrSs (white, straight) : 1 rrss (white, curved) : 1 Remember that, since one parent is homozygous, that parent can only give an r and an s to children. The other parent is heterozygous for both genes, so it can give either allele in any combination with the other gene. Since there are four ways to combine two items with two variations each, there are four equally likely offspring. So, there's a 1/4 or 25% chance that any given "child" will be white and straight. Librariankt
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