Paunenge uchitaura nezvemhando dzemapatya, marudzi maviri anozivikanwa zvikuru. Zvakafanana (kana monozygotic ) mapatya anogadzirwa kubva kune rimwe rinotanga kubereka rinoparadzaniswa; fraternal (kana dizygotic ) mapatya anoumbwa kubva kumunhu maviri akasiyana nemumvuri / mazai evha. Asi polar body twinning ishoko rinoshandiswa kurondedzera chitatu chetatu chinonzi twinning chinowanikwa apo an ous unfertilized anoparadzaniswa muzvikamu zvisina kufanana uye ipapo chikamu chimwe nechimwe chinowanzogadzirwa nemaviri maviri evanhu.
Nzira yePolar Body Twins Inoitika sei
Iova, iyokadzi yepabonde, inotora nzira yekuparadzanisa inonzi meiosis kubereka. Izvo zvinogadzira muzukuru mana wechiduku haploid, imwe neimwe ine hafu yechromosomes. Imwe yevana ndiyo egg cell (oocyte) apo mamwe matatu anonzi miviri ye polar. Kazhinji, maoocyte chete anowanikwa kuti awane hutachiona, asi masimba emapurisa anopera. Asi kutevera chirevo chemuviri wepurasitiki, maoocyte uye muviri wePolar ungangove wakagadzirwa uye hukura, zvichiita mapatya.
Ndiwo Mapatya Azvo Polar Body Twins?
Polar body twinning chirevo kana chirevo. Izvo hazvina kuonekwa maitiro epilar body twins uye hapana nzira yekuziva kana kusimbisa kana polar body twinning. Kunyange zvazvo zvingave zvichifadza kufungidzira kuti mapatya ako akafanana, asi kwete zvakangofanana, hapana nzira yekuziva zvechokwadi kana iri polar body twins. Apo chirwere chezygosity chinogona kusimbisa kana mapatya ari monozygotic kana dizygotic, makambani anoita zygosity kuongororwa kuti aone mapatya maviri haapi kupa muedzo we polar body twins.
NdezvePolar Body Twins Akafanana?
Apo mapatya akafanana anobva kune imwechete zygote uye yakafanana chaizvo, mababa mapatya ane anenge hafu yemagenhi avo akafanana, akafanana nevana vemunin'ina. Saka zvinotevera kuti muviri wemapururu unenge uine mhando imwe yemagene kubva kuna amai vavo, asi zvakasiyana-siyana mumakemikari kubva kuna baba vavo.
Mune mafungiro, polar body twins inowanzoita 75% yeavo genetic markers, zvishoma pane zvakafanana mapatya asi kupfuura kupfuura mapatya ehama . Zvichida vanotarisa zvakafanana, asi kwete zvakafanana.
Polar body twinning dzimwe nguva inotsanangurwa sehafu yakafanana twinning. Inoparadzaniswa kubva kumashini akafanana akaenzana, apo mbeu mbiri dzinodiridza mazai ega imwe chete nokuti egg inotapira musati waita. Kunyange zvazvo chiitiko chemajinga akafanana-akafanana akatsigirwa, polar body twinning inoramba ichifungidzira.
> Sources:
Australian Twin Registry. "Ndeapi marudzi eTwinning?" Yakasvika paFebruary 12, 2016. http://www.twins.org.au/twins-and-twin-families/twin-resources/faq#twinning
Moskwinski, R., Ed. Twine Kuti Tinyengetedze: Bhuku Rakazara reVabereki Rakawanda Kuberekwa Vana. Harpeth House Publishing: 2002. Print.
> Proactive Genetics. "Chii chinonzi Polar Body Twins?" Yakasvika muna February 12, 2016. http://www.proactivegenetics.com/faq-twins-genetics.html#56.
Wells, D. uye Hillier, SG "Miviri yePolar: chakavanzika chezvisikwa uye chiremba chinoreva." Molecular Human Reproduction. Bhuku 17, Nyaya 5, Chivabvu 2011.