Explore BrainMass
Share

Explore BrainMass

    order of the loci in the chromosome

    This content was COPIED from BrainMass.com - View the original, and get the already-completed solution here!

    If a woman is heterozygous for three x-linked loci AaBbDd, She has seven sons with follow genotypes

    Two are X^ABd Y
    three are X^abDY
    one is X^ABD Y
    one is X^Abd Y

    1) what is most likely combination of alleles on each the mothers chromosomes
    Answer:
    abD
    ABd

    2) which is the sons are recombination, bw what genes is the cross over
    answer:
    abD is result of combination
    crossing over between B and D

    3) list other possible recombinant genotypes
    answer:
    abd
    aBd
    abD

    please verify answers

    © BrainMass Inc. brainmass.com October 10, 2019, 12:49 am ad1c9bdddf
    https://brainmass.com/biology/dna-chromosomes-and-genomes/order-loci-chromosome-309012

    Solution Preview

    You look to have answered the first part of the question very well. With multiple sons having ABd and abD it is likely that those are the two combinations of alleles on the maternal chromosomes.

    For the next two parts however, you need to take a guess at the order of the loci in the chromosome: i.e, does it make sense to have a crossover between the B and D sites? Remember ...

    Solution Summary

    The order of the loci in the chromosomes is examined.

    $2.19