Ihe Nlereanya nke Ajụjụ Mkparịta ụka Gametogenesis
Gametogenesis bụ usoro ihe dị ndụ nke mkpụrụ ndụ nje na-ekewa ma na-ekewa iji ghọọ gametes, ma ọ bụ mkpụrụ ndụ mmekọahụ. Usoro a dị mkpa maka ịmụpụta mmekọahụ ma dị iche n'etiti ụmụ nwoke na ụmụ nwanyị. N'isiokwu a, anyị ga-atụle gametogenesis site n'ịkọwa ọkwa ya, ịtụle nsogbu ihe atụ, na inye mkparịta ụka zuru oke nke usoro a.
Ịghọta Gametogenesis
Mmepụta egwuregwu nwere usoro abụọ bụ isi: spermatogenesis n'ime ụmụ nwoke na oogenesis n'ime ụmụ nwanyị. Usoro abụọ a dị iche na ebe ha nọ, oge ntozu okè, na ọnụọgụgụ mkpụrụ ndụ ikpeazụ ha mepụtara. Na spermatogenesis, otu spermatogonium na-emepụta mkpụrụ ndụ sperm anọ, ebe na oogenesis, otu oogonium na-emepụta naanị otu àkwá tozuru okè.
1. Mmepụta mkpụrụ ndụ ihe nketa
– Ebe: Ọ na-eme na seminiferous tubules na testes.
– Usoro: Spermatogonia na-abanye mitosis iji mepụta spermatocyte nke mbụ. Semmetocytes nke mbụ ndị a na-abanye meiosis nke mbụ iji mepụta semmetocytes nke abụọ abụọ, nke na-abanye meiosis nke abụọ iji mepụta semmetids anọ. Semmetids ndị a na-ekewapụ onwe ha ka ha bụrụ semmet tozuru okè (spermatozoa).
– Oge: Usoro a na-eme mgbe niile mgbe ị tolitere ma na-adịru ndụ gị niile.
2. Omezi
– Ebe: Ọ na-eme n'ime ovaries.
– Usoro: Mmepe mbụ na-amalite tupu a mụọ nwanyị, mgbe oogonia na-abanye na mitosis iji mepụta primary oocytes, nke na-abanye n'oge ezumike ogologo oge na prophase I nke meiosis. Mgbe ntozu okè gasịrị, kwa ọnwa, otu primary oocyte na-aga n'ihu na meiosis I iji mepụta otu esote oocyte na otu obere ahụ polar (na nke na-adịghị arụ ọrụ). Oocyte nke abụọ a ga-aga n'ihu na meiosis II ma ga-emecha ya naanị ma ọ bụrụ na njikọta ya emee.
– Oge: Usoro ummalite nke afọ na-ewe ọtụtụ afọ, na-amalite tupu a mụọ nwa ma na-akwụsị na nsọpụ.
Ajụjụ Ihe Nlereanya na Mkparịta ụka Banyere Gametogenesis
Iji nyere aka mee ka nghọta anyị banyere gametogenesis sikwuo ike, lee ụfọdụ ajụjụ atụ yana mkparịta ụka zuru oke.
Ajụjụ nke Mbụ:
Kọwaa isi ihe dị iche n'etiti spermatogenesis na oogenesis n'ihe gbasara nsonaazụ ikpeazụ na oge usoro ahụ.
Azịza:
Ihe dị iche n'etiti spermatogenesis na oogenesis bụ:
- Nsonaazụ ikpeazụ:
– N'ime spermatogenesis, spermatogonium ọ bụla na-emepụta spermatozoa anọ na-arụ ọrụ nke ọma.
– N'ụzọ dị iche, na oogenesis, oogonium ọ bụla na-emepụta naanị otu mkpụrụ ndụ àkwá na-arụ ọrụ (ovum) na ọtụtụ ahụ polar (nke na-anaghị arụ ọrụ).
– Oge nhazi:
– Mmepe nke mkpụrụ ndụ ihe nketa na-amalite mgbe mmadụ toro eto ma na-aga n'ihu ruo mgbe ọ ga-aka nká.
– Uogenesis na-amalite tupu a mụọ nwa. A na-etolite oocytes mbụ ma kwụsị na prophase I nke meiosis ruo mgbe ọ tolitere. Mgbe ọ tolitere, usoro a na-aga n'ihu na okirikiri kwa ọnwa na mwepụta nke oocytes nke abụọ. Okpomọkụ a na-akwụsị mgbe ọ kwụsịchara ịhụ nsọ.
Ajụjụ nke Mbụ:
Kedu ka meiosis dị na spermatogenesis si dị iche na meiosis na oogenesis?
Azịza:
Ọdịiche dị na nkewa meiosis n'etiti spermatogenesis na oogenesis:
- Mmepe nke spermatogenesis:
– Meiosis na-apụta n'usoro n'enweghị nkwụsị mgbe ntozu okè gasịrị, na-emepụta spermatid anọ site na spermatogonium ọ bụla.
– Usoro abụọ nke meiosis (I na II) na-aga n'ihu mgbe niile ma na-akwụsị site na ịmepụta spermatids nke na-etolite ghọọ spermatozoa.
- Ọkpụkpụ:
– Ọtụtụ n'ime usoro meiosis m na-eme tupu a mụọ m, wee kwụsị na prophase I ruo mgbe m toro.
– Mgbe ntozu okè gasịrị, meiosis I na-emecha n'otu udele kwa ọnwa, nke na-eme ka ọ bụrụ otu udele nke abụọ na otu ahụ polar.
– A na-emecha Meiosis II naanị ma ọ bụrụ na e jiri sperm mee ka àkwá ahụ dị ọcha.
Ajụjụ nke Mbụ:
Kedu ọrụ nke ahụ polar nke a na-emepụta na oogenesis?
Azịza:
Ahụ polar na-arụ ọrụ nke ọma iji tụfuo usoro kromozom ndị ọzọ a na-emepụta n'oge meiosis. Nke a bụ ụzọ sel si ebelata chromozom site na diploid gaa na haploid. Ahụ polar anaghị arụ ọrụ ọzọ ma na-emebikarị. Isi ihe ha bu n'obi bụ ijide n'aka na ovum tozuru oke nwere cytoplasm na organelles zuru oke iji kwado mmepe mbụ ma ọ bụrụ na a gbakọta ya.
Ajụjụ nke Mbụ:
Gịnị mere spermatogenesis ji eme ka ọtụtụ mkpụrụ ndụ nwoke dị otú a?
Azịza:
Mmebi ahụ nke mkpụrụ ndụ ihe nketa (spermatogenesis) na-emepụta ọtụtụ mkpụrụ ndụ ihe nketa maka ihe ndị a:
– Ọganihu nke Ịzụlite Nwatakịrị: Asọmpi iru na ịgbapụta nwatakịrị dị oke elu, naanị otu mkpụrụ ndụ ihe nketa na-aga nke ọma n'ịzụlite nwatakịrị.
– Ihe Mgbochi Ahụ: Mkpụrụ nwoke ga-esi n'ikpu gaa ebe dị anya, site n'akpa nwa, n'ime akpa nwa, wee banye n'ime akpa nwa ebe àkwá dị.
– Ndụ Mkpụrụ Nwoke: Ndụ mkpụrụ Nwoke anaghị adịte aka mgbe ọ gbasịrị mkpụrụ, yabụ ọnụọgụgụ buru ibu na-eme ka ohere nke ịmụ nwa dịkwuo mma.
Penutup
Ịghọta gametogenesis dị oke mkpa maka ịghọta bayoloji ọmụmụ na mkpụrụ ndụ ihe nketa. Ọdịiche dị mkpa dị n'etiti spermatogenesis na oogenesis na-egosipụta atụmatụ dị iche iche nke bayoloji maka ịmụpụta nwa nke ọma. Site na nsogbu omume na mkparịta ụka, anyị nwere ike ịghọta nke ọma usoro ndị a ma ghọta mgbagwoju anya nke usoro ndụ. Enwere m olileanya na isiokwu a na-enye ntọala siri ike maka ịmụ gametogenesis ma na-enye aka n'ịkwadebe maka ule metụtara bayoloji mkpụrụ ndụ na ịmụpụta nwa.
