Gwai iri

Kamar yadda ka sani, kwai ya zama kwayar ƙwayar mace, wanda idan aka haɗu tare da spermatozoon ya samar da zygote. Ita ce wadda ta ba da wata sabuwar kwayar halitta. Bari mu dubi nau'in qwai, in gaya maka irin nau'in kwai yake a cikin mutum kuma ya ba su jinsin.

Waɗanne irin kwayoyin kwayoyin sun ɓoye?

Don haka a cikin ilmin halitta, dangane da adadin da ke ƙunshe a cikin gwairan ovoplazme (wadataccen abinci), yana da al'ada don rarrabe nau'i 4:

• alecital - oocytes, wanda yolk ya kasance babu shi;
• oligoletsitalnnye - a cikin abun da ke ciki akwai karamin gwaiduwa. Wannan nau'in halayyar mafi yawan invertebrates, da dabbobi masu shayarwa. Irin wannan kwai a mutum;
• jaraba - dauke da adadi mai tsaka (amphibians);
• lalata - jima'i jima'i, waxanda suke da wadata sosai a gwaiduwa. Irin wannan kwai shine halayyar dabbobi masu rarrafe, kifi, tsuntsaye.

Har ila yau, dangane da yadda ake rarraba gwaiduwa a cikin ƙwayoyin cuta, yana da al'ada don rarrabe:

• isoletsitalny - rarraba rarraba yalwa a cikin ovoplazme;
• anisoletsitalny - an rarraba gwaiduwa a kan kwai. A wannan yanayin, za'a iya raba wannan subtype a cikin telolecital (gwangwadon ƙwayoyi a daya daga cikin sandunan) da kuma centrolecital (yad din yana mayar da hankali a cikin cibiyar, yana kewaye da tsakiya kuma an rufe shi da ƙananan ƙwayar ovoplasm).

Menene bambance-bambance a tsarin tsarin qwai?

Nauyin nau'i na sama ya nuna bambancin a cikin tsarin su kuma ya nuna cikakkiyar sauye-sauye a cikin jinsin jima'i a cikin tsari na phylogenesis.

Dabbobi na dukan dabbobi, ciki har da mutane, wanda ya kasance a cikin tarihin cigaban tarihi, bisa ga tsarin su na ciki shi ne oligolecital.

Wannan tsari, na farko, shi ne saboda gaskiyar da ake bukata don tarawa na kayan abinci mai gina jiki a cikin ovoplasma ba ya nan, saboda ci gaba da amfrayo ya fito cikin mahaifa. Abubuwa masu mahimmanci masu amfani da tayin ya karu tare da jinin jini.

A cikin dabbobi, matakai na farko na fannin jiki, har zuwa tsuntsaye, yolk a cikin kwai yana da ƙananan, tun lokacin ci gaba da kwayar halitta ya auku a cikin yanayin ruwa.

Hakan ya bayyana yawan karuwar gilashi a cikin dabbobi masu rarrafe da tsuntsaye, tun da farko, cewa embryos daga cikin wadannan dabbobi suna cikin wuri mai rufewa kuma suna kewaye da tsummoki mai yawa, wanda ba za a iya ɗauka ba.