Matsayi: Tsarin halittar mutum ya samo asali ne daga duka nau'in halittarsa da kuma tasiri daga yanayin da ya rayu. Wani ɓangare mai mahimmanci na bambancin phenotypic a cikin yawan jama'a ya haifar da bambancin genotypic. Halin zamani na juyin halitta ya bayyana juyin halitta a matsayin canji a tsawon lokaci a cikin wannan nau'in kwayar halitta. Yawan wani allele zai zama mafi yawa ko žasa dangane da wasu nau'o'in wannan kwayar halitta. Bambancin ya ɓace lokacin da sabon allele ya kai ga ma'anar gyara<unk> lokacin da ya ɓace daga yawan jama'a ko kuma ya maye gurbin allele na kakanninsu gaba ɗaya. Zaɓin halitta zai haifar da juyin halitta ne kawai idan akwai isasshen nau'in kwayoyin halitta a cikin yawan jama'a.
juyin halitta da kwararar kwayar halitta