Combinative mgbanwe na ya evolutionary uru

Combinative mgbanwe bụ isi na-akpata intraspecific di iche iche nke ihe niile dị ndụ ntule. Ma nke a ụdị mkpụrụ ndụ ihe nketa mgbanwe na-eduga naanị guzobe ọhụrụ n'ịgwa nke àgwà ama ugbu a. Na mgbe combinative mgbanwe na ya usoro anaghị eme ka onye ahụ nke a fundamentally dị iche iche site n'usoro n'ịgwa. Ntoputa nke kpamkpam ọhụrụ Njirimara n'ihi na dị iche iche site n'usoro ọdịiche, o kwere omume na na ikpe nke intraspecific mutational mgbanwe.

Combinative mgbanwe kpebisiri ike site ọdịdị nke omumu usoro. N'ihi na nke a ụdị mkpụrụ ndụ ihe nketa mgbanwe e ji mara n'ile ọhụrụ genotypes na ndabere nke e guzobere ọhụrụ site n'usoro n'ịgwa. Combinative mgbanwe egosipụta onwe ya ugbua na-adọ nke guzobere gametes (izizi mkpụrụ ndụ). Ọzọkwa, onye ọ bụla dị otú ahụ cell na-anọchi anya naanị otu homologous chromosome si ọ bụla ụzọ. Ji eziokwu ahụ bụ na chromosomes ịdaba izizi cell enweghị usoro, adịru gametes n'otu organism nwere ike iche ike ezu na site n'usoro set. Ọ na-adịghị na-egosi ihe ọ bụla mgbanwe na chemical ọdịdị nke kpọmkwem ụgbọelu nke butere n'aka ọmụma.

N'ihi ya, combinative mgbanwe bụ n'ihi na a dịgasị iche iche nke recombination nke mkpụrụ ndụ ihe nketa ndị na-ama ugbu a na chromosome set. Nke a na ụdị mkpụrụ ndụ ihe nketa mgbanwe a na-adịghị conjugate na mgbanwe chromosome na site n'usoro owuwu. Isi mmalite combinative mgbanwe nwere ike ịbụ naanị na Filiks na-eme n'oge na mbenata cell nkewa (meiosis) na njikọta spam.

Elementrị (nta) unit dị iche iche recombinations butere n'aka ihe onwunwe, na-eme guzobere ọhụrụ site n'usoro n'ịgwa, a na-akpọ RECON. Onye ọ bụla recon kwekọrọ na abụọ nucleotides (ụlọ na ihe onwunwe nke nucleic acid) na abụọ-tọrọ atọ DNA ụmụ irighiri na otu nucleotide, mgbe ọ na-abịa na Ọdịdị nke na-alụbeghị di-tọrọ atọ nucleic acid nje. Recon bụghị divisible mgbe agafe (exchange usoro n'etiti paired homologous chromosomes n'oge conjugation) na mgbe nile-ebute site ná na zuru.

Combinative mgbanwe na eukaryotic mkpụrụ ndụ na ụzọ atọ:

1. Genetic recombination na usoro nke ịgafe-ihe karịrị, adịru chromosomes na-kpụrụ enwe ọhụrụ n'ịgwa nke alleles.
2. Independent random dispersion nke chromosomes n'oge anaphase nke mbụ meiotic nkewa nzọụkwụ, adịru niile gamete nweta ha onwe ha mkpụrụ ndụ ihe nketa atụmatụ.
3. Casual nwetara izizi mkpụrụ ndụ n'oge njikọta spam.

Mere, site ná ndị a atọ usoro combinative mgbanwe ọ bụla cell zaigọtụ kpụrụ akpụ site na anọ na nke gametes, enweta a kpam kpam pụrụ iche set nke mkpụrụ ndụ ihe nketa na ozi. Na ndị dị otú mgbanwe butere n'aka na-akọwa na nnukwu iche iche. Genetic recombination dị oké mkpa maka mmalite nke ọ bụla umu, dị ka ọ na-kere site na ọlu di n'aru dịgasị iche iche nke genotypes. Nke a na-enye ọ bụla heterogeneity nke ndị bi. Ọdịdị nke ntule, nyere na ya na onye e ji mara, na-ekpebi elu arụmọrụ eke nhọrọ, na-enye ya ohere na-ahapụ naanị ihe ịga nke ọma Nchikota butere n'aka àgwà. N'ihi incorporation nke ọhụrụ ntule na omumu usoro, na mkpụrụ ndụ ihe nketa mejupụtara na-nọgidere mma.