Xa uxoxa ngeentlobo zamawele, ezimbini iintlobo ziyaqatshelwa ngokubanzi. Iifayile (okanye i- monozygotic ) ifomu kwifom ekhunjini eliqhekezayo; amaqabane (okanye i- dizygotic ) amawele amawele avela kwiintlobo ezimbini ezihlukeneyo zesininzi / yeqanda. Kodwa i- polar body twinning iyigama elisetyenziselwa ukuchaza uhlobo lwesithathu lwe-twinning eyenzekayo xa i-ovum engabonakaliyo idibanisa kwiindawo ezingalingani kwaye emva koko inxalenye nganye iyahlanjululwa yi-sperm ehlukeneyo.
Indlela i-Polar Body Twins iyenzeka ngayo
I-ova, isetyhini yesini yesini, ihamba kwinkqubo yokwahlula okuthiwa i-meiosis ukuvelisa. Inkqubo ikhiqiza iiseli ze-haploid ezine zezala, ngasinye sinesiqingatha se-chromosomes. Enye yezine yileli yeqanda (i-oocyte) ngelixa ezinye ezintathu zibizwa ngokuba ngamaziko e-polar. Ngokuqhelekileyo, kuphela i-oocyte ifumaneka ukuchumisa, ngelixa izidumbu ze-polar ziphela. Kodwa ngokulandela imfundiso ye-polar body twinning, zombini i-oocyte kunye nomzimba we-polar mhlawumbi uza kufakwa kwaye uhlakulele, okubangele amawele.
Ngaba Amabhinqa Am i-Polar Body Twins?
I-polar body twinning ingumxholo okanye ingcamango. Akukho zihlandlo ezibonakalayo zamawele emzimbeni kwaye akukho ndlela yokuchonga okanye yokuqinisekisa okanye ukuguqula umzimba. Ngelixa kunokuba lunomdla ukucinga ukuba amawele akho afana, kodwa akufani ngokufanayo, akukho ndlela yokukwazi ngokuqinisekileyo ukuba ngaba ngamawele emzimbeni. Xa uvavanyo lwe-zygosity lunokuqinisekisa ukuba ngaba amawele angama-monozygotic okanye i-dizygotic, iinkampani ezenza uvavanyo lwe-zygosity ukufumana uhlobo lwe-twin alunikezeli uvavanyo lweewele zomzimba.
Ngaba iiPilly Body Twins zifana?
Apho amawele afanayo avela kwi-zygote enye kwaye efana nezofuzo, amawele azalanayo anesigamu sezifo zawo ezifanayo, afana nantoni na. Ngaloo ndlela kulandela ukuba amawele emzimbeni omzimba ayakuba negalelo elifanayo lezakhi zofuzo kumama wabo, kodwa uguquko oluninzi kwiijethi ezivela kubabawo.
Kwimbono, amawele emzimbeni omzimba athatha isabelo malunga ne-75% yeempawu zabo zofuzo, ngaphantsi kwamawele angamafanane kodwa angaphezulu kwamawele omzalwana . Mhlawumbi zibukeka zifana noko, kodwa azifani ngokufanayo.
Ngamaxesha athile ukuhlanjululwa komzimba ngamaplaza kuthiwa yi-twinning efanayo. Ikwahluke kwi-twinning efanayo, apho imbewu yesibini iqubuthela iqanda elilodwa kuba iqanda lihlukana phambi kokuchumisa. Nangona i-twinning efana neyodwa iqinisekisiwe, i-twinning body body is still hypothetical.
> Imithombo:
I-Australian Twin Registry. "Ziziphi iintlobo zokuHluma?" Kufumaneka ngoFebhuwari 12, 2016. http://www.twins.org.au/twins-and-twin-families/twin-resources/faq#twinning
Moskwinski, R., Ed. Amacwecwe Okukhupha: Iincwadi ezipheleleyo zabazali bezingane ezininzi zokuzala. IHarpeth House Publishing: 2002. Print.
> I-Genetics esebenzayo. "Yiyiphi i-Polar Body Twins?" Kufumaneka ngoFebruwari 12, 2016. http://www.proactivegenetics.com/faq-twins-genetics.html#56.
I-Wells, D. kunye ne-Hillier, i-SG "Imizimba yamathambo: imfihlakalo yabo yezinto eziphilayo kunye nenjongo yekliniki." Ukuveliswa koLuntu. Umqulu 17, Issue 5, ngoMeyi 2011.