1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Genetics: Colorblindness and Blood Type

  1. Jul 6, 2010 #1
    1. The problem statement, all variables and given/known data

    A colorblind man with blood type AB marries a woman with normal vision and blood type A who is heterozygous for both traits. What are the odds of having a daughter that is colorblind and has blood type A?

    2. Relevant equations

    Xc Y IA IB x XC Xc IA i

    3. The attempt at a solution

    Dont know if it is 2/8=1/4 or 2/16=1/8
  2. jcsd
  3. Jul 7, 2010 #2
    Since these traits are not linked.. it might be easier to visualize these crosses as separate then bring the information together at the end. If we cross the Xc Y x XC Xc, then (1/4) of the offspring to be colorblind females. If we cross the blood types IA IB x IA i, then we get (1/2) of the offspring to be blood type A.

    Since the target phenotype was a female that was color blind AND blood type A... we multiply the answers.

    (1/4)(1/2)= (1/8) will be colorblind type A females <----- Final Answer
  4. Jul 7, 2010 #3
    thanks for the explanation...i understand it even better now!!
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook