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SYNTHESIZE YOUR KNOWLEDGEButterflies have anX-Y sex determinationsystem that isdifferent
Chapter 15, Problem 14(choose chapter or problem)
SYNTHESIZE YOUR KNOWLEDGEButterflies have anX-Y sex determinationsystem that isdifferent from thatof flies or humans.Female butterfliesmay be either XYor XO, while butterflieswith two ormore X chromosomesare males.This photographshows a tiger swallowtailgynandromorph,which is half male (left side) and half female (right side).Given that the first division of the zygote divides the embryointo the future right and left halves of the butterfly, propose ahypothesis that explains how nondisjunction during the firstmitosis might have produced this unusual-looking butterfly.
Questions & Answers
QUESTION:
SYNTHESIZE YOUR KNOWLEDGEButterflies have anX-Y sex determinationsystem that isdifferent from thatof flies or humans.Female butterfliesmay be either XYor XO, while butterflieswith two ormore X chromosomesare males.This photographshows a tiger swallowtailgynandromorph,which is half male (left side) and half female (right side).Given that the first division of the zygote divides the embryointo the future right and left halves of the butterfly, propose ahypothesis that explains how nondisjunction during the firstmitosis might have produced this unusual-looking butterfly.
ANSWER:It is possible that during the first division of the zygote, there was a rare chromosomal nondisjunction event that produced an unequal division of the chromosom