Ngenxa yokuba unina umzimba wakhe uthwala ukukhulelwa, ezininzi ezinokubakholelwa ukuba izizathu zokukhulelwa kwesisu zihambisana nezinto ezikhoyo kumama. Kodwa ekubeni iingxaki ze-chromosome zibangelwa imbangela yokukhulelwa kwesisu kunye nesiqingatha se-chromosomes yomntwana esakhulayo evela kubaba, unokuba uzibuze ukuba into ethile kwisidoda ingaba sisizathu sokusweleka kwesisu-ngakumbi ukuba uye wahamba ngamathambo amaninzi.
Ingaba Iingxaki Ngezidalwa Zibisi Zenza Imimiselo?
Impendulo mhlawumbi. Kwixesha elidlulileyo, abaphandi baye bagxila kwiqanda njengeyona nto ingundoqo yeengxaki ze-chromosome ngezizathu ezininzi. Esinye isizathu kukuba (ngokuqhelekileyo) kuphela iqanda elilodwa litshintshiweyo umjikelezo ngamnye wesini, kodwa ukhetho lwendalo luyenzeka phakathi kwesidoda ngaphambi kokuchumisa okwenzekayo ukuba kuqhutywe ukuba "kulungele" ukufikelela kwiqanda. Ukongezelela, izifundo zofuzo ezivela kwiimfucuza ezivela kumathambo zifumene iimpazamo kwisigaba sokuqala se-meiosis yesimama (ukuphuhliswa kwangoko kweqanda) njengokuba ngumthombo obangelwayo ongabonakaliyo obangela ukulahleka kwamathambo.
Kodwa uphando olwenziwe kule minyaka elishumi edlulileyo luchaza ukuba oku kusenokuba njalo. Ezinye iziganeko zokulahleka kwamathambo eziqhelekileyo zibonakala zibandakanya ubaba ophethe iziganeko eziphezulu ze- chromosomes kwisidoda sakhe. Akukho ziqikelelo zangempela malunga nokuba isilwanyana sisisiphi isifo kwiimfucuza eziphindaphindiweyo, kunye neengxaki ze-chromosome kwisidoda azikholelwa ukuba yimbangela ebalulekileyo yokuphindwa kwemali, kodwa kubonakala ngathi inokwenzeka-ngokukodwa kwindoda Idiza yabonisa i-morphology engaqhelekanga okanye ezinye iimpawu zokuzala.
Amanye amagqirha angancoma ukuba amadoda aphumelele iimvavanyo kumgangatho wesidlo xa kungekho nanye isizathu esenza i-miscarriages ephindaphindiweyo. Ikhwalithi yesininzi ingamanye amaxesha, kodwa kungekho rhoqo, kuphuculwe kunye neenguqu zokuphila okanye imichiza.
Ukuqhathaniswa kokuQala kwesiThathu
Phantse i-3 ye-4 i-miscarriages iyenzeka ngexesha le-trimester yokuqala yokukhulelwa.
Ngokuqhelekileyo, ukuba ibhinqa linokuphuphuma kwesisu ngexesha lekota yokuqala, kwakukho ingxaki kuma-chromosomes omntwana. Ama-Chromosomes ziibhloko zeDNA eziqulethe zonke iinkcukacha ezifunekayo ngexesha lophuhliso.
Ngeengxaki ze-chromosomal, into eyenzekayo ngexesha lokukhulelwa kunye nombungu ufumana inani elingafanelekanga lama-chromosomes (kakhulu kuninzi okanye embalwa kakhulu) ekugqibeleni kubangelwa ukuphuma kwesisu. Ingqalelo, kungekhona zonke iintsana ezinamanani angama-chromosomes alahlekile. Umzekelo, iintsana ezine-trisomy 21 zine-Down syndrome.
Ngamanye amaxesha, kukho into eyenzekayo eyenza ukukhulelwa kwesisu okungahambi nanye nama-chromosomes. Ngokomzekelo, ukuba kukho iingxaki kwi-placenta, umngcipheko wokukhulelwa kwesisu usanda. Khumbula ukuba umntwana ufuna i-placenta ukufumana igazi lomama.
Nazi ezinye izizathu zokukhulelwa komzimba ngexesha lokuqala kwekota:
- ukutshaya
- ukunyanya
- ukusetyenziswa kweziyobisi ezingekho mthethweni
- benzisa utywala
Ukutshatyalaliswa kweSibini kweThathu
Nangona amaninzi amathambo ayenzeka ngethuba lokuqala lokuqala, ukulahlekelwa ngamathambo kuyenzeka ngexesha le-trimester yesibini.
Nazi ezinye zezizathu zokuba ukuphuphuma kwesisu kuqhutywe ngekota yesibini:
- iswekile
- isifo sesifo
- lupus
- iingxaki zehomoni
- sulelo
- ukutyhefu kokutya
- umlomo wesibeleko
- fibroids
Nceda uqaphele ukuba ezi zinto ziyingozi nje. Ngamanye amazwi, akusiwo onke amabhinqa anesifo sikashukela aya kulwa nesisu.
Ekugqibeleni, abaninzi abantu abaye balala ngamathambo abaza kukwazi ukuba kutheni bafumana enye. Zininzi izinto ezibangela umngcipheko wokukhulelwa kwesisu.
Imithombo:
Al-Hassan, S., A. Hellani, A. Shah-Shahrani, M. Al-Deery, K. Jaroudi1 kunye no-S. Coskun. "I-Sperm Chromosomal engavumelekanga Kwizigulane ezinokuThatyathwa okungaqhelekanga." I-Biology yeeNkqubo kwiMithi yokuLawula 2005, Vol. 51, No. 1, iphepha 69-76.
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UHassold, uTerry, uHeather Hall kunye noPatricia Hunt. "Imvelaphi yabantu abangenayo i-humanuploidy: apho siye sahlala khona, apho siya khona." I-Molecular Genetics 2007 16 (R2): R203-R208; i-doi: 10.1093 / hmg / ddm243.
Ilanga, uFii, uEvelyn Ko noRenee H. Martin. "Ngaba kukho ubudlelwane phakathi kwesimo se-sperm chromosome ne-sperm morphology?" I-Biology yokuzala kunye ne-Endocrinology 2006, 4: 1iyi: 10.1186 / 1477-7827-4-1.
Zini, Armand, noJamie Libman. Umonakalo weDerm umonakalo: ukubaluleka kweklinikhi ngexesha lokuncediswa ukuzaliswa. " I-CMAJ • Ngo-Agasti 29, 2006; 175 (5).