InterviewSolution
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InterviewSolution
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Question : Describefemalehetrogamyand itstypes. HeterogameticFemales: |
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Answer» Solution :In thismethodof sex determination, the homogameticmalepossessestwo .X. chromosomesas in certaininsectsandcertainvertebrateslikefishes, repliesand birdsproducinga singletypeof gamete ,whilefemalesproducedissimilargametes .The femalesexconsistsof a single.X.chromosomeor one.X. and one.Y . CHROMOSOME . Thusthe femalesareheterogametic an producetwo typesof eggs.Heterogameticfemales are of twotypes, ZO - ZZ typeandZW - ZZ type . ZO - ZZ type. This methodof SEXDETERMINATION isseenin certainmoths ,butterfliesand domesticchickens . In thistype ,the femaleposses sessingle.Z.chromosomein itsbody cellsand is hetrogametic(ZO) PRODUCING two kindsof eggssome with.Z. chromosomeand somewithout.Z.chromosome, while the malepossessestwo.Z. chromosomes and ishomogametic(ZZ) .  ZW - ZZ type Thismethodof sexdetermination occursincertaininsects(gypsy moth ) and in vertebratessuch as fishes, reptiles and birds. In this methodthe femalehas one.Z.and one.W.chromosome(ZW) producingtwotypes of eggs , somecarrying theZchromosomesand somecarrythe W chromosome. The malesexhas two .Z. chromosome and is homogametic(ZZ)producinga singletype of SPERM . 
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