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Homework Help: Linkage question?

  1. Dec 14, 2014 #1
    Genes A/a and B/b are linked and known to be 20 map units apart. Individuals heterozygous for both of these genes (genotypes= AB/ab) were mated with each other. If there 2000 offspring from this cross, how many of the offspring would you expect to show Ab or aB phenotypes?
    I know that the gametes for each individual separate into 40%AB, 40%ab, 10%Ab, and 10% aB, but i'm confused on how to find the number of offspring from these percentages. If someone could help it would be much appreciated!
  2. jcsd
  3. Dec 14, 2014 #2


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    2017 Award

    Staff: Mentor

    I moved the thread to the homework section.

    Just multiply the fractions with 2000?
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