DNA, Genes & Chromosomes kye ki? Ka twogere mu ngeri ennyangu!

Wali weebuuzizzaako kiki ekyakufuula mu ngeri gy’oli? Langi y’enviiri zo, langi y’amaaso go, obuwanvu, enkula y’omubiri gwo, bino byonna bisalibwawo bitya? Eky’okuddamu kiri mu bintu bino bye tugenda okwogerako leero, DNA , obuzaale, ne chromosomes . Wadde nga biyinza okuwulikika ng’ebigambo ebitonotono ebya ssaayansi, bino bintu byangu nnyo okutegeera. Ka tulabe.

DNA (Asidi ya Deoxyribonucleic) kye ki? Mu ngeri ennyangu...

Lowooza ku mubiri gwo gwonna ng’ekitabo ekinene eky’okuyigiriza. Ekitabo ekyo kikubuulira engeri buli kitundu ky’omubiri gwo gye kirina okukola, engeri gy’osaanidde okulabika, n’engeri gy’osaanidde okulabika. Ekibinja ekyo eky’ebiragiro kiyitibwa `DNA (Deoxyribonucleic acid).` Kiri mu buli katoffaali mu mubiri gwo. Mu ngeri ennyangu, DNA ye pulaani y’ekyo ky’oli.

DNA ekolebwa mu ki?

DNA nayo erina olulimi lwayo okuwandiika ekitabo kino eky’ebiragiro. Olulimi olwo lulina ennukuta nnya. Bbo bali:

• Adenini (A) .
• Ekirungo kya Cytosine (Cytosine – C) .
• Thiamine (Ekirungo kya Thiamine – T) .
• Guanine (Guanine – G) .

Ensengekera zino ennya ez’eddagala ze zikola “ebigambo” ebiri mu kitabo kyo eky’ebiragiro, nga bisengekeddwa mu nsengeka ezimu. Nga ennukuta zaffe ez’Olusinhala bwe ziteekebwa wamu okukola ebigambo. Teebereza, mu mubiri gw’omuntu mulimu bases zino obuwumbi nga 3! Ebitundu 99% ku byo bye bimu ku buli muntu. Ekyo ekisigadde 1% kye kikufuula ow’enjawulo ku balala, omuntu wo ow’enjawulo. Tekyewuunyisa?

DNA buli kiseera yeekolera kkopi. Kwe kugamba, ekola kkopi z’ekitabo ky’omubiri gwo, okufaananako kkopi eziwandiikiddwa n’engalo. Kikozesa ebigambo ebikolebwa nga kigatta emisingi egyo.

Kale obuzaale kye ki?

Mu bukulu, obuzaale bulinga ebizimba omubiri gwo . Ensengekera z’obuzaale ezimu ziwa ebiragiro ebikwata ku kukola puloteyina. Omulimu gwa puloteyina kwe kutegeeza omubiri gwo engeri z’omubiri z’oyagala okuba nazo. Okugeza ebintu nga langi y’enviiri zo ne langi y’amaaso go. Ensengekera z’obuzaale ezimu ziwandiika ekintu ekiyitibwa `RNA (Ribonucleic acid),` ekikola emirimu emirala.

Tufuna tutya obuzaale?

Tosobola kugula buzaale buno okuva mu dduuka ly’obuzaale. Ozifuna ku maama wo ne kitaawo. Okubeera omutuufu, ofuna kkopi emu ey’obuzaale bwo okuva mu ggi lya maama wo ate kkopi emu okuva mu nsigo za kitaawo . Bw’omala okufuna obuzaale bubiri, obuzaale obwo bwawukana, bwe bukola kkopi, era ne bukola okutuusa lwe bujjuza ekitabo kyo kyonna eky’ebiragiro. Teeberezaamu, mu mubiri gwo mulimu obuzaale obuli wakati wa 20,000 ne 25,000!

Kati ka tulabe chromosomes kye ziri.

Chromosomes nsengekera eziringa obuwuzi. Zisangibwa wakati mu butoffaali, mu nyukiliya. Chromosomes zirimu DNA ne proteins. Zijja mu sayizi ez’enjawulo. Zikolebwa puloteyina ez’enjawulo eziyitibwa `Histones` ezizifuula ezikwatagana era nga zibeera mu bbanga munda mu nyukiliya. Lowooza, singa tewaali histones ezo, chromosomes zaffe zandibadde mpanvu nga ffe! Chromosomes ze biragiro byennyini obutoffaali bwo bye bufuna ebikufuula ow’enjawulo era ow’enjawulo.

Abantu balina chromosomes mmeka?

Mu budde obwabulijjo, omuntu omulamu obulungi alina okuba n’ensengekera z’obutonde (chromosomes) 23 (46 zonna awamu). Chromosomes zino zaawulwamu ebitundu 22 ebirina ennamba (ebiyitibwa `autosomes`) n’ebibiri ebibiri ebya chromosomes ez’ekikula (chromosomes za `X` ne `Y`). Ofuna pair emu okuva ku maama wo ate endala okuva ku kitaawo.

Kyokka, si bulijjo nnyo, ensobi ziyinza okubaawo ng’obutoffaali bweyawukanye ne bukola kkopi. Kino bwe kibaawo, abantu abamu bayinza okuba ne chromosome ey’enjawulo mu pair (embeera eyitibwa `Trisomy`) oba chromosome emu mu pair eyinza okubula (embeera eyitibwa `Monosomy`).

Kakwate ki akaliwo wakati wa DNA, obuzaale, ne chromosomes? Zikola zitya?

Ebintu bino ebisatu - DNA, obuzaale, ne chromosomes - bikwatagana ne bikolagana okutonda omuntu gw’oli.

• Chromosomes ze zitwala DNA munda mu butoffaali.
• DNA y’evunaanyizibwa ku kuzimba n’okulabirira ensengekera yo ey’omuntu.
• Ensengekera z’obuzaale bitundu bya DNA yo ebikuwa engeri zo ez’enjawulo ez’omubiri era ebikufuula ow’enjawulo ku balala.

Mu ngeri ennyangu, bino byonna bwe bikwatagana, omubiri gwo gufuna ebiragiro ebijjuvu ebisalawo engeri obutoffaali bwo gye bulina okweyisaamu.

DNA esangibwa wa? Kirabika kitya?

DNA eri mu buli katoffaali mu mubiri gwo. Ebisinga obungi biri mu nyukiliya (wakati) ya buli katoffaali. Waliwo ne DNA ezimu mu mitochondria (obutundutundu obutono obuli munda mu butoffaali obukola amaanyi).

Ku ky’endabika ya DNA, ekolebwa ensengekera z’eddagala ennya ezaayogeddwako emabegako: adenine (A), cytosine (C), thymine (T), ne guanine (G). Babiri ba base bano bajja wamu mu babiri babiri; A bulijjo akwatagana ne T, ate C bulijjo akwatagana ne G. Babiri ba base bano, awamu ne molekyo ya ssukaali ne molekyo ya phosphate (eyitibwa `nucleotide`), bikola ekifaananyi ekiringa amadaala ekyekulungirivu (era ekiyitibwa `double helix`). Base pairs ziringa amadaala g’amadaala, ate ssukaali ne phosphate biringa ebikondo by’omu ngalo.

Chromosomes zirabika zitya?

Chromosomes zirina ensengekera eringa obuwuzi. Puloteeni za chromosomal (`histones` ezoogeddwako waggulu) zizinga DNA, ng’obuwuzi obuzinga ku spool y’obuwuzi, nga bunyigiriza DNA mu butundutundu obutonotono okutuuka munda mu butoffaali. Teebereza, singa chromosomes tezazinga DNA bwe zityo, DNA yo yandibadde ffuuti nga 6 obuwanvu okuva ku nkomerero okutuuka ku nkomerero!

Embeera z’Obuzaale kye ki?

Embeera y’obuzaale bulwadde obuva ku buzaale obutali bwa bulijjo. Enkyukakyuka y’obuzaale bwe buzaale obutakoppololwa bulungi mu kiseera ky’okugabanya obutoffaali. Kwe kugamba, ensengeka yaayo oba enkula yaayo ya njawulo ku buzaale obulala mu mubiri. Bw’oba ​​olina enkyukakyuka mu buzaale, omubiri gwo guyinza obutasobola kukula na kukola bulungi.

Oluusi osobola okusikira enkyukakyuka eno ey’obuzaale okuva mu bazadde bo. Oluusi osobola n’okukulaakulanya enkyukakyuka y’obuzaale mu mubiri gwo mu butanwa, nga tewali muntu yenna mu maka go eyalina enkyukakyuka eyo oba embeera y’obuzaale. Waliwo enkumi n’enkumi z’embeera z’obuzaale nga zino.

Enkyukakyuka mu buzaale zibaawo zitya?

Enkyukakyuka mu buzaale zibaawo obutoffaali bwo bwe bwawukana ne bukola obutoffaali obupya. Obutoffaali bwe bwawukana, buba ng’okuwandiika n’engalo enkyusa eyasooka ey’ekitabo ekikulaga omubiri gwo. Waliwo ekifo kinene eky’ensobi mu nkola eno. Kiba ng’okubuuka olupapula oba essuula ng’osoma ekitabo. Bw’okola ensobi (enkyukakyuka mu buzaale), ekitabo kyo eky’ebiragiro kiyinza okuwa omubiri gwo ebiragiro ebikyamu. Oluusi enkyukakyuka eno tekyusa ngeri mubiri gwo gye gukolamu. Naye oluusi enkyukakyuka eyo esobola okukulemesa okukola obulungi. Byonna bisinziira ku kika ky’ekintu gene eyo ky’ekola enkoodi.

Waliwo ebikeberebwa ebiyinza okukebera embeera y’obulamu bw’obuzaale bwange?

Yee, waliwo okukebera obuzaale kungi. Zino zikozesa sampuli y’omusaayi gwo, olususu lwo, enviiri, oba bw’oba ​​oli lubuto, amazzi g’omu lubuto. Ebigezo bino bisobola okuzuula enkyukakyuka mu buzaale bwo, chromosomes oba proteins zo. Ebigezo bino bisobola okulaga embeera z’obuzaale ezenjawulo n’obuzaale obukyusiddwa. Ate era bw’oba ​​olina essuubi ly’okuzaala, okukebera kuno kuyinza okukuyamba okuzuula akabi akali mu kuzaala omwana alina embeera y’obuzaale.

Nnyinza ntya okulongoosa obulamu bwa DNA yange?

Okusobola okutumbula obulamu bwa DNA yo, olina okulabirira obulungi omubiri gwo. Kubanga DNA yo y’evunaanyizibwa ku ngeri gy’okulamu n’engeri gy’okola. Osobola okulongoosa obulamu bwo okutwalira awamu ng’okozesa:

• Lya emmere ennungi .
• Dduyilo.
• Kuuma omugejjo omulungi.
• Weewale okunywa sigala n’okukozesa ebintu ebikolebwa mu taaba .

Ensengekera y’obutonde (Homologous Chromosome) kye ki?

Ensengekera y’obutonde (homologous chromosomes) ye chromosomes bbiri, emu eva ku maama ate endala okuva ku taata. Bombi balina okuba n’amawulire ag’obuzaale ge gamu, mu bifo bye bimu. Chromosomes nazo zisobola okuba nga tezirina homologous. Kino kitegeeza nti amawulire agakwata ku buzaale bwe galimu ga njawulo, oba gali mu bifo bya njawulo.

N’ekisembayo, by’olina okujjukira (Obubaka bw’okutwala awaka) .

DNA yo, obuzaale bwo, ne chromosomes byo bye bimu ku bitundu ebikulu ebikufuula ky’oli. Wadde nga ntono nnyo nga teziyinza kulabibwa n’amaaso, omulimu gwe zikola gwewuunyisa era munene nnyo. Kale, kiri gy’oli okugoberera obulamu obulungi n’okukuuma DNA yo, obuzaale, ne chromosomes nga bikola bulungi. Bw’oba ​​weeyagala, lowooza ku mikwano gino emitonotono munda mu mubiri gwo. Bwe baba balungi bwokka osobola okubeera obulungi.