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QONUNI DUYUMI MENDEL (QONUNI TAJZIYA)

Hangomi duragakunii naslhoi gibridii yakum, ki alomati yakkhela dorand, dar nasli duvvum ham alomati modari va ham alomati padari bo yak tanosubi muayyan 3:1 zohir meshavand. YAne 3/4 hissai alomatho dominanti va 1/4 hissai onho resessiviand. In natijai on ast, ki naslhoi yakum geterozigoti (Aa) buda, dar nasli duvvum ham alomati dominanti va ham alomati resessivi paydo meshavad. In holatro tajziya menomand.

Hamin tariq, tajziya holati taqsimshavii alomathoi dominanti va resessivi bo miqdori muayyan (3:1) ast. Az in tanosub malum megardad, ki alomati resessivi dar gibridhoi nasli yakum (G1) nest nashuda, balki az jonibi genii dominanti pakhsh shudaand va dar nasli duvvum (G2) az nav zohir gardidaand.

Pas, qonuni duvvumi G.Mendelro chunin sharh dodan mumkin ast: az duraga kardani du fardi nasli yakum bo hamdigar (du fardi geterozigoti) dar nasli duyuum tajziyai tanosubi miqdori az rui fenotipi 3:1 va genotipi 1:2:1 mushohida karda meshavad.

Agar in tanosubro bo foiz nishon dihem, chunin meshavad: 25% gomozigothoi dominanti, 50% geterozigotho, 25% gomozigothoi resessivi. Dar mavridi dominantii nopurra (merosguzorii miyona) dar gibridhoi nasli duyum (G2) tajziyai fenotipi va genotipi yakkhelaand (1:2:1).

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