Because of non-disjunction in some stocks of Drosophila. melanogaster, about 1 in 65,000 egg cells have two copies of the X chromosome and about 1 in 375 egg cells have no X chromosome. Assuming that meiosis in males is always normal', what is the expected frequency of XXX females and XO males arising from any number of fertilized eggs? Do not be concerned as to whether it is lethal or not.

Human Heredity: Principles and Issues (MindTap Course List)
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Chapter6: Cytogenetics: Karyotypes And Chromosome Aberrations
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Problem 19QP: The majority of nondisjunction events leading to Down syndrome are maternal in origin. Based on the...
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Because of non-disjunction in some stocks of Drosophila. melanogaster, about 1 in 65,000 egg
cells have two copies of the X chromosome and about 1 in 375 egg cells have no X chromosome.
Assuming that meiosis in males is ‘always normal', what is the expected frequency of XXX
females and XO males arising from any number of fertilized eggs? Do not be concerned as to
whether it is lethal or not.
Transcribed Image Text:Because of non-disjunction in some stocks of Drosophila. melanogaster, about 1 in 65,000 egg cells have two copies of the X chromosome and about 1 in 375 egg cells have no X chromosome. Assuming that meiosis in males is ‘always normal', what is the expected frequency of XXX females and XO males arising from any number of fertilized eggs? Do not be concerned as to whether it is lethal or not.
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