Question: A woman is heterozygous for three X-linked loci: AaBbDd. She has
seven sons with the following ge…



A woman is heterozygous for three X-linked loci: AaBbDd. She has
seven sons with the following genotypes: (7 marks)

two are X ABd Y

three are X abD Y

one is X ABD Y

one is X Abd Y

a) What is the most likely combination of alleles on each of the
mother’s X chromosomes?

b) Which of the seven sons is/are the result of recombination?
Between which genes did the crossover occur in the mother’s oocyte
to create each recombinant X?

– Please between which genes did the crossover occur in the
mother’s oocyte

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