Dihybrid Crosses: Kuongorora Nheyo dzeMendelian Genetics
Imwe yepfungwa dzakakosha mu genetics ndeye dihybrid cross. Pfungwa iyi yakatanga kutaurwa naGregor Mendel, mumongi wemuzana remakore rechi19 uye musayendisiti anozivikanwa sababa ve genetics. Mukuedza kwake nemiti yepizi, Mendel akabudirira kuburitsa mapatani ekutanga enhaka ayo ave hwaro hwe genetics yemazuva ano. Chinyorwa chino chichanyatsoongorora dihybrid cross, misimboti yayo, uye mashandisirwo ayo uye kukosha kwayo muminda yakasiyana-siyana yesainzi.
Kunzwisisa Michinjikwa yeDihybrid
Musanganiswa we dihybrid musanganiswa wemarudzi maviri akasiyana-siyana ehunhu. Izvi zvakasiyana nemusanganiswa we monohybrid, uko hunhu humwe chete hunoongororwa. Semuenzaniso, muzvirimwa zvepizi, munhu angada kuongorora nhaka yehunhu huviri panguva imwe chete, senge ruvara rwembeu (yero kana girini) uye chimiro chembeu (yakatenderera kana yakakwenya).
Kuti tinzwisise michinjikwa ye dihybrid, tinofanira kunzwisisa mitemo miviri yakataurwa naMendel:
1. Mutemo weKupatsanura: Munhu wega wega ane ma alleles maviri pahunhu hwega hwega, uye ma alleles aya anopatsanurwa panguva yekuumbwa kwe gamete.
2. Mutemo weKusarudzika Kwakazvimirira: MaAlleles ehunhu hwakasiyana anobatanidzwa ega panguva yekuumbwa kwegamete. Izvi zvinoreva kuti kugara nhaka kwehunhu humwe hakukanganisi kugara nhaka kwehumwe hunhu.
Matanho muDihybrid Crossing
Ngatifungei nezvemuenzaniso wekare wemusanganiswa we dihybrid wakaitwa naMendel: kutarisa ruvara nechimiro chembeu dziri mupizi.
1. Kuzivikanwa kweGenotype yevabereki: Vabereki vane hunhu hwakasiyana-siyana, semuenzaniso, YyRr (Y = yero, y = girini, R = yakatenderera, r = yakakwenya).
2. Kuumbwa kweGamete: MaAlleles ehunhu huviri hwakasiyana anogona kubatana kuti aumbe magamete mumisanganiswa inotevera: YR, Yr, yR, yr. Misanganiswa imwe neimwe iyi inoitika nekakawanda kakaenzana nekuda kwemutemo wemhando dzakasiyana dzeakazvimirira.
3. Kuumbwa kweChati yePunnett: Nekushandisa chati yePunnett, tinogona kufanotaura kusanganiswa kwevana vanogona kunge vari muchimiro chejini. Muchiitiko ichi, chati yePunnett ye4×4 inoshandiswa kunyora kusanganiswa kwegamete dzese dzinogona kuitika.
4. Kuziva Chiyero chePhenotypic: Kubva mukubatanidzwa uku, tinogona kuona phenotypes dzinobuda. Muchiitiko chaMendel, chiyero chephenotypic chakawanikwa i9:3:3:1 yemusanganiswa wakazara (9 yero denderedzwa, 3 denderedzwa regirini, 3 yero yakakwinya, 1 green yakakwinya).
Kukosha uye Mashandisirwo
Pfungwa yekuyambuka kwe dihybrid haisiyo chete inokosha mu biology, asiwo ine mashandisirwo akawanda munyika dzakasiyana-siyana:
1. Kubereka Zvirimwa neMhuka
Mukurima, mitemo yenhaka yeMendelian inoshandiswa kugadzira mhando dzemiti nemhuka dzine hunhu hunodiwa. Semuenzaniso, nekunzwisisa kuti hunhu humwe hunogarwa sei nhaka, vapfuyi vanogona kusarudza mhuka dzine hunhu hwakasiyana kuti dzibereke vana vakanaka.
2. Majini Ekurapa
Muvanhu, nheyo dzakafanana dzinoshandiswa mukudzidza nezvekugara nhaka kwezvirwere zvemajini. Zvimwe zvirwere zvinodzorwa nemajini anopfuura rimwe chete (polygenic), uye kunzwisisa kupindirana uku kwakaoma kunogona kubatsira mukuongorora chirwere uye kukura kwekurapa.
3. Biotechnology uye Genetic Engineering
Kunzwisisa zvakakwana majini ekutanga, kusanganisira dihybrid crosses, kwakakosha mu biotechnology. Izvi zvinoita kuti majini akwanise kushandiswa kugadzira zvipenyu zvine hunhu hwaunoda, mune zvehutano uye mumaindasitiri.
4. Tsvagiridzo yeSainzi neDzidzo
Mukutsvagurudza kwekutanga, ma "dihybrid crosses" anoramba ari chishandiso chakakosha chekudzidza nhaka yemajini uye kudyidzana kwe allelic. Mudzidzo, pfungwa iyi inoshandiswa kudzidzisa vadzidzi zvekutanga zvemajini.
Zvipingamupinyi uye Kuoma Kwazvo
Zvisinei, pane zvipingamupinyi papfungwa iyi iri nyore yekusanganiswa kwemarudzi akasiyana-siyana. Haasi majini ese anogarwa nhaka ega; mamwe majini ari pedyo nepedyo pane chromosome imwe chete uye anogona kugara nhaka pamwe chete, chiitiko chinozivikanwa se gene linkage. Izvi zvinowedzera rumwe rutivi rwekuoma kwezvidzidzo zvemajini izvo zvinoda kutariswa mukuongorora kwakawedzerwa.
Zvitsva Zvitsva
Mumakumi emakore achangopfuura, kufambira mberi mune matekinoroji ezvemajini, akadai seDNA sequencing uye maturusi ekuongorora genomics, kwakadzamisa kunzwisisa kwedu kwemajini kupfuura misimboti yaMendel. Zvisinei, misimboti yaMendel, sekushandiswa kwayo pamichinjiko ye dihybrid, ichiri kukosha uye inowanzo shanda sehwaro hwezvinhu zvitsva zvakaoma kuwana.
Mhedziso
Dihybrid crosses ndiyo nheyo huru yemageneti ekare. Kunzwisisa kuti hunhu huviri hunogona sei kugara nhaka pamwe chete kunopa kunzwisisa kwakadzama nzira huru dzekugara nhaka. Nekushandiswa kwakapararira mukurima, mushonga, uye biotechnology, matekiniki aya haangopfumisi ruzivo rwedu rwekutanga rwebiology chete asiwo anopa mhinduro dzinoshanda kumatambudziko chaiwo. Kunyangwe matambudziko matsva akaomarara achimuka, hwaro hwemageneti eMendelian hunoramba huri danho rekutanga rakakosha kune chero munhu ari kutsvaga nyika inonakidza yemageneti.
