BIOMALIK

Tsarin Chromosome a cikin Halittu Masu Rai Chromosomes suna ɗaya daga cikin mahimman abubuwan da ke cikin ƙwayoyin halitta masu rai, suna aiki a matsayin babban "jirgin ruwa" don bayanan kwayoyin halitta. A cikin ƙwayoyin halitta, ana adana DNA, wanda ke ɗauke da kwayoyin halitta waɗanda ke daidaita halaye, ayyukan jiki, da ci gaban halitta daga ƙwayar halitta guda zuwa cikakken mutum. Tsarin ƙwayoyin halitta yana da ban sha'awa ba kawai saboda siffarta ba har ma da... Kara karantawa

Marufin DNA a cikin Kwayoyin Halittar Kwayar Halitta A cikin kowace ƙwayar halitta ta eukaryotic - kamar ta mutane, dabbobi, tsire-tsire, da fungi - ana adana umarnin rayuwa a cikin nau'in DNA (deoxyribonucleic acid). Idan aka buɗe DNA daga ƙwayar halitta guda ɗaya ta ɗan adam, zai kai tsawon mita biyu. Kalubalen: ta yaya irin wannan dogon zare zai iya shiga cikin ƙwayar halitta, wanda diamitarsa ​​​​ƙananan micrometers ne kawai? … Kara karantawa

Tsarin Histones da Chromatin A cikin kwayar halittar eukaryotic, DNA ba ta wanzu a matsayin "zare" wanda ba a bar shi ba. Da ace an buɗe dukkan DNA na ɗan adam, da tsawonsa ya kai kimanin mita biyu, duk da cewa ƙwayar halittar tana da 'yan micrometers kaɗan a diamita. Don tabbatar da cewa wannan babban tsawon kayan kwayoyin halitta zai iya dacewa yayin da yake kasancewa mai sauƙin isa ga mahimman hanyoyin halittu, ƙwayar... Kara karantawa

Methylation na DNA a cikin Bayyanar Halittar Halitta Methylation na DNA yana ɗaya daga cikin mahimman hanyoyin epigenetic, yana daidaita lokacin da kuma yadda ake bayyana kwayar halitta ba tare da canza jerin tushen DNA da kanta ba. A takaice dai, bayanan kwayoyin halitta sun kasance iri ɗaya, amma "karantawa" na iya canzawa. Wannan tsari yana taka muhimmiyar rawa a cikin ci gaban tayi, bambancewar ƙwayoyin halitta, kula da asalin nama, da… Kara karantawa

Epigenetics a cikin Tsarin Halittar Halitta Epigenetics wani reshe ne na ilmin halitta wanda ke nazarin canje-canje a cikin aikin kwayar halitta wanda ba canje-canje a cikin jerin DNA ke haifarwa ba. A wata ma'anar, epigenetics yana bayanin yadda za a iya kunna ko kashe kwayoyin halitta ba tare da canza lambar kwayar halitta da kanta ba. Wannan ra'ayi yana da mahimmanci saboda yana taimaka mana mu fahimci dalilin da yasa ƙwayoyin halitta a cikin jiki waɗanda ke raba DNA iri ɗaya za su iya… Kara karantawa

Kwayoyin Halittar Prokaryotic a cikin Ilimin Halittar Kwayoyin Halittar Prokaryotic ginshiƙi ne na gina kwayoyin halitta, yana nuna yadda rayuwa, a matakinta mafi sauƙi, ke adanawa, bayyanawa, da kuma watsa bayanan kwayoyin halitta. Prokaryotes—wanda ya haɗa da ƙwayoyin cuta da archaea—suna da ƙananan ƙungiyoyin kwayoyin halitta idan aka kwatanta da eukaryotes, duk da haka suna aiki a matsayin samfura masu kyau don fahimtar ƙa'idodin asali na kwafi na DNA, daidaita kwayoyin halitta, maye gurbi, da… Kara karantawa

Tsarin Halittar Halitta a cikin Kwayoyin Eukaryotic Kwayoyin Halitta a cikin ƙwayoyin eukaryotic - kamar na dabbobi, tsire-tsire, fungi, da protists - suna da tsari mai rikitarwa da tsari mai kyau. Ba kamar prokaryotes ba, waɗanda galibi suna da DNA mai zagaye wanda ke cikin yanki ɗaya (nucleoid), ƙwayoyin eukaryotic suna adana mafi yawan kayan halittarsu a cikin tsakiya a cikin nau'in chromosomes masu layi. Don haka DNA wanda… Kara karantawa

Haɗakar Halitta a cikin Ilimin Halittu Haɗakar Halitta yana ɗaya daga cikin muhimman hanyoyin da ake bi a fannin ilmin kwayoyin halitta, yana ba da damar yin musayar abubuwa, sake tsara su, ko sake haɗa su. Wannan tsari yana taka muhimmiyar rawa wajen ƙirƙirar bambancin kwayoyin halitta, kiyaye daidaiton kwayoyin halitta, da kuma gyara lalacewar DNA. A cikin halittu masu rai—daga ƙwayoyin cuta zuwa mutane—haɗakar halitta kayan aiki ne na halitta don kiyaye rayuwa… Kara karantawa

Gyaran DNA a Kwanciyar Hankali Tsarin kwayoyin halitta shine ikon kayan kwayoyin halitta na halitta don kiyaye jerin DNA da tsarinsa akan lokaci. Wannan kwanciyar hankali yana da mahimmanci saboda DNA tana adana umarnin halittu waɗanda ke sarrafa kusan kowace aikin tantanin halitta, daga rarrabuwa da metabolism zuwa martanin muhalli. Duk da haka, DNA ba kwayar halitta ce mai cikakken daidaito ba. Kowace rana, ... Kara karantawa

Sauye-sauyen Halitta a Tsarin Halittu Sauye-sauyen kwayoyin halitta canje-canje ne na dindindin a cikin jerin DNA, babban kayan kwayoyin halitta a kusan dukkan halittu masu rai. Waɗannan canje-canje na iya faruwa a cikin "harafin" DNA guda ɗaya (tushen nitrogen) ko a cikin wani yanki mai tsawo. Kodayake kalmar "sauye-sauye" galibi ana danganta ta da cuta ko wani abu mai cutarwa, a cikin tsarin halittu sauye-sauye a zahiri... Kara karantawa