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Homework Help: Chi-Square Test Crosses

  1. Oct 9, 2007 #1
    I have no idea where to start on this and would appreciate some help:

    1. The problem statement, all variables and given/known data

    In the rabbit the dominant gene B specifies black hair pigment and its recessive allele b specifies brown hair pigment. Alleles of the albino locus, chinchilla (cch) and Himalayan (ch) affect the distribution of pigment in the coat. True-breeding (homozygous) black chinchilla rabbits are crossed with true-breeding brown Himalayan rabbits. The progeny, which are black chinchilla, are crossed to brown Himalayan rabbits: the phenotypes are given elow.

    Phenotype of F2/Number of F2:

    Black Chinchilla/191
    Brown Chinchilla/138
    Black Himalayan/147
    Brown Himalayan/184

    a. What is the map distance between these two genes (without using the mapping function)?

    b. Could the numbers seen in the F2 progeny be explained by segregation of unlinked genes?

    Use Chi-Square Analysis to estimate the probability for this segregation pattern.
  2. jcsd
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