Mahi whakaputa uri me te hiranga koiora o te whāiti pūira

kawea te mahi whakaputa uri o te tinana i roto i te wā hononga o rua tohuhema (pūtau iroriki) i roto i te hui, me te whanaketanga o te tinana āpiti kākano muri - wairakau hua manu. I roto i ngā pūtau moepuku metua i te huinga etahi o te n-pūira. ka karanga ia haploid. Kei te tango kākano he huinga o enei, ko reira he pūtau diploid, arā, tau 2n reira pūira: kotahi whaea me kotahi metua. Koiora meiotic wehenga faufaa motuhake rite i runga i te pūtau ngā i roto i te meka e whakawhetai ki reira, te pūtau haploid i hanga i te pūtau diploid.

whakamāramatanga

i huaina whāiti pūira i roto i te koiora te te ahua o te whāū pūira; e tika ana ki ona diploid pūtau somatic o te repe taihemahema e wehea ki tohuhema 1n. A, no te nga wairakau te pata te, i reira te mea he hononga o tohuhema. Ko te kupu, Kei te ora i te reira huinga pūira 2n. Meaning o pūira ko ki te whakarite tiaki o te tūturu ia ahua o ora rauropi pūira me te rahinga e tika ana o DNA.

whakaahuatanga

Pūira - he tonu te tukanga. Kei a ia ko e rua momo o wehewehe i ä whai tahi i te tahi: pūira ahau me te whāiti pūira II. Ia o nga tukanga, i roto i te tahuri, ngā o prophase, metaphase, anaphase, telophase. Ko te wehenga tuatahi o te whāiti pūira whāiti pūira ahau ranei, haurua te maha o ngā pūira, i.e. i reira ko te āhuatanga o te wehenga whakaiti pera-ka karanga. A, no te he reira te wā tuarua o te whāiti pūira whāiti pūira II ranei, e kore e pūtau haploid whakawehi te huringa, kei te ora i te reira. huaina ana tēnei tukanga ko te wehenga equational.

te pūtau katoa i roto i te wā o te whāiti pūira, kawe etahi mōhiohio i runga i te taumata ira.

• prophase Meiotic o te tuatahi - atamira ahu whakamua pūpūira helix me te hanganga o pūira. I te mutunga o tenei mahi rawa matatini te rauemi ira reira i roto i tona puka taketake - 2n2 pūira.
• mai Metaphase - mai me te taumata mōrahi o helix. e kore tonu e ke te rauemi ira.
• haere tahi Anaphase o pūira e te whakaiti. Ia rua o pūira metua homai tetahi o ona pūtau tamahine. ke rauemi ira i roto i te hanganga, kia rite ki tau pūira i te hawhe e: he tika hoki ia pou o te pūtau mo 1n2 pūira.
• Telophase - wāhanga, ka hanga i te matua, ka wehea cytoplasm. E hanga pūtau tamahine, he ratou 2 me ia o rua chromatids. ie whakaturia o pūira i roto i te haploid ratou.
• kite interkinesis atu, he whati poto i waenganui i te wāhanga tuatahi me te tuarua o te whāiti pūira. He rite ki te tomo i te wāhanga tuarua o te whāiti pūira, e puta i te tikanga taua rite taua o whāū nga pūtau tamahine e rua.

Na ko te auraa koiora o whāiti pūira i roto i te meka e i roto i tona taahiraa tuarua e tikanga matatini i hanga kē pūtau haploid 4 - 1n1 pūira. Ie, homai te ora kotahi pūtau whaea diploid ki wha - ia huinga pūira haploid. I roto i tetahi o te wāhanga tohu meiotic tuatahi recombines rauemi ira, a ka kawea te taahiraa tuarua i roto i te nekehanga o ngā pūira me chromatids ki amo rerekē o te pūtau. Enei nekehanga - te puna o te rerekētanga me ngā rerekē o te intraspecific.

hua

Ko te kupu, ko te hiranga koiora o whāiti pūira, tino nui. Tuatahi o te katoa, kia tuhia te reira rite te matua, te wā matua o te orokohanga o te tohuhema. whakarite pūira te whakawhiti o te mōhiohio ā-ira i ngā momo tetahi kaiao ki tetahi, ngā e ratou uri puremu e. Pūira āhei ngā intraspecific puta no te mea ngā pūtau tamahine rerekē kore anake i ngā mātua, engari rerekē hoki.

I tua atu, i te hiranga koiora o te whāiti pūira ngā i roto i te whakarato whakaiti i te maha o ngā pūira i roto i te kau ina e hanga e nga pūtau iroriki. Pūira whakarite ratou haploid; i te wa o te kikiritanga faaho'ihia mai te whakatō kākano hanganga pūira diploid te.