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Question : How is sex determined in human beings?

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Solution :Genesdeterminessexin HUMAN beingsare locatedon two sexchromosomes, calledallosomes .In mammals , sexdeterminationis associatedwithchromosomaldifference betweenthe twosexes ,TYPICALLY XX females andXY males .23pairsof humanchromosomesinclude 22 pairsof AUTOSOMES (44A)and onepair of sexchromosomes (XX orXY) . Femalesare homogameticproducingonlyone typegametes(egg) , eachcontaining one X chromosomewhile the malesare hetrogameticproduingtwo typesodspermswith Xand Y chromosomes. An independentlyevolvedXX , XY SYSTEMOF sexchromosomes alsoexist in Drosophila .


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