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Homework Help: Linkage And Mapping Of Genes

  1. Oct 9, 2007 #1
    I would appreciate help with this problem, if at all possible!

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

    Snapdragons, homozygous for the recessive allele ls of the leaf form gene, have serrated leaves, the normal allele l+ is dominant and responsible for a smooth leaf phenotype. Individuals homozygous for the recessive allele pW of the petal color locus, have white petals; the normal red color results from the dominant p+ allele. A cross is performed between plants homozygous for serrated leaves, red petals, and plants homozygous for smooth leaves, white petals.

    F1 snapdragons of genotype: l s p + / l + p W are testcrosses with snapdragons of the two recessive alleles. The progeny obtained are shown below. Calculate the recombination frequency and map distance between the two genes:

    a. Without using the mapping function


    b. Using the mapping function.

    Phenotype of Progeny/Number

    Serrated Leaves - Red Petals/264
    Smooth Leaves - White Petals/37
    Serrated Leaves - Red Petals/41
    Smooth Leaves - White Petals/258
  2. jcsd
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