Developmental biology part 7 | spermatogenesis and oogenesis in mammals

Developmental biology part 7 | spermatogenesis and oogenesis in mammals
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Spermatogenesis is the process by which spermatozoa are produced from male primordial germ cells through mitosis and meiosis. The initial cells in this pathway are called spermatogonia, which yield primary spermatocytes by mitosis. The primary spermatocyte divides meiotically into two secondary spermatocytes; each secondary spermatocyte then completes meiosis as it divides into two spermatids. These develop into mature spermatozoa, also known as sperm cells. Thus, the primary spermatocyte gives rise to two cells, the secondary spermatocytes, and the two secondary spermatocytes by their subdivision produce four spermatozoa.[1]
Spermatozoa are the mature male gametes in many sexually reproducing organisms. Thus, spermatogenesis is the male version of gametogenesis. In mammals it occurs in the male testes and epididymis in a stepwise fashion. Spermatogenesis is highly dependent upon optimal conditions for the process to occur correctly, and is essential for sexual reproduction. DNA methylation and histone modification have been implicated in the regulation of this process.[2] It starts at puberty and usually continues uninterrupted until death, although a slight decrease can be discerned in the quantity of produced sperm with increase in age (see Male infertility).
Oogenesis, ovogenesis or oögenesis /ˌoʊ.əˈdʒɛnɨsɪs/[1] is the creation of an ovum (egg cell). It is the female form of gametogenesis; the male equivalent is spermatogenesis. It involves the development of the various stages of the immature ovum.
In mammals, the first part of oogenesis starts in the germinal epithelium, which gives rise to the development of ovarian follicles, the functional unit of the ovary.
Note that this process, important to all animal life cycles yet unlike all other instances of cell division, occurs completely without the aid of oo spindle-coordinating centrosomes.[2][3]
Oogenesis consists of several sub-processes: oocytogenesis, ootidogenesis, and finally maturation to form an ovum (oogenesis proper). Folliculogenesis is a separate sub-process that accompanies and supports all three oogenetic sub-processes. Source of the article published in description is Wikipedia. I am sharing their material. Copyright by original content developers of Wikipedia.
Link- en.wikipedia.org/wiki/Main_Page

[@hafizusmanhafizusman4801]

No need to read from book after listening to the lecture . Thank u sir keep up good work ♥️

[@shomusbiologyofficial]

Glad to hear that you're getting benefit from my lectures

[@sucharitapidikaka]

Thank you so much sir..there was so many confusions in mind before ,but now I got cleared about the gametogenesis after watch your video..ur teaching is really understandable soon..god bless you n keep uploading more videos sir.. thanks a lot again.👍👍

[@sukanya_nath]

I am thankful to this KZbin page.

[@shomusbiologyofficial]

You're welcome. Glad to hear that you're getting benefit from my lectures

[@bhavika.jethani2282]

@16:50 Polar body and secondary oocyte will have same number of chromosomes because they are products of meiosis also if secondary oocyte will have any more than 23 chromosomes (humans) it will lead to chromosomal anomalies. @Shomu's Biology

[@cynthiamoll6960]

Thank you! You've helped me a lot! When you repeat the terms it really helps me remember!

[@shomusbiologyofficial]

You're welcome

[@jyothihugar7871]

u r simply awesome in bio ua patience knowledge reflects in every video tq

[@vedanidhisulebhavi1948]

sir total of how many sperms and eggs are produced during spermatogenisis and oogenisis.

[@zahoorbhat394]

Sir first gonocytes are produced. Later they change into spermatogonia or oogonia.

[@bernnyfelix7565]

Great video.... Keep up the enthusiasm.

[@kushalkundu8695]

Attachment of sperm with egg occurs at the fallopian tube. That creates d zygote. This moves through the fallopian tube. The cleavage occurs at d fallopian tube. After blastula is formed ,it contains trophoblast nd embryoblast, the zygote sheds of zona pellucida and gets attached to d ciliated wall of uterus( not attached in d fallopian tube) and then further deveolopment like placentatn will take place. Very nice informative video. Thank u for doing this.

[@rabanighullam6253]

I appreciated , it was so easy to learn. thanks

[@mdfawazayubi3678]

Thank you Sir, you are One of the Best Teacher in KZbin

[@shomusbiologyofficial]

Thank you so much for appreciating my efforts. Glad to hear that you're getting benefit from my lectures

[@ziatabasum6566]

Thank you sooooooo much sir....it was really very helpful....

[@ealinakundu]

Thank you so much sir this is the best video in KZbin 😀

[@joannelopez6817]

magnificent! thank you very much sir :)

[@annieriaz6073]

Sir kindly tell what's the meaning of mitotic arrest

[@homosapien6294]

Sir than what is secondary spermatocyte? Plz guide me

[@mohamedshafim2446]

Thank you sir .Iam preparing zoology optional for civilservice , your vedios helped me a lot.thank you.

[@mohamedshafim2446]

Sir you may start a new venture. Zoology optional subject coaching for civilservice....what u say?

[@bhabeshkarmakar1971]

than you for this video. please keep it up.

[@nutansingh4057]

Tq sr for clear explanation ......kitne channels dekh lu but smjh apka hi ata h

[@shomusbiologyofficial]

You're welcome

[@sreejaramachandran4732]

Very helpful. Tankuuuuuu so much.....

[@mimimom7666]

after zygote t it transfer to uterus

[@mistudas7128]

This video have really helpful for my study ,I was confused that the difference between spermatocytes and oocyte .now my doubts is clear ,,,tnq sir 🙂

[@shomusbiologyofficial]

You're welcome. Glad to hear that you're getting benefit from my lectures

[@mistudas7128]

@@shomusbiologyofficial yes sir I follow your every vedio for my study ,I am zoology student of tripura ,,,I wish that you explain also much more zoology ,human physiology and botany topic ,,,,,yes all vedio really helpful for my study ,,,tnq sir 🙂

[@vishnushri4671]

SIR NO WORDS.Handsome.

[@shomusbiologyofficial]

Thank you

[@swekshapande17]

Woow very nice sir; u looking like a student sir 😊very simply explained all doubt sir thanks a lot 🙏😊🙏

[@shomusbiologyofficial]

You're welcome. Glad to hear that you're getting benefit from my lectures

[@prakritijha5465]

You are a legend..💜

[@himanirawat9957]

Ur teaching skills are awesome sir.. thank u so much

[@shomusbiologyofficial]

You're welcome. Glad to hear that you're getting benefit from my lectures

[@rajibnamasudra2687]

please make a different video for hormonal regulation

[@alaanaeem1989]

good video ) thanks

[@rekamnawaz3432]

thank you sir........

[@anjishnuchakraborty3221]

Please explain it a little aloud as it seems very difficult to hear the sound . Otherwise the video was absolutely perfect. Thank you very much but please explain it aloud

[@morsmb1]

ty so much

[@padminiharish7625]

Hello sir...Ur teaching style is simple n excellent.

[@shomusbiologyofficial]

+Padmini Harish thank you.

[@lavanyav4176]

nice video. lt is easy to understand

[@rittickadhikary6978]

Gurudev, for this reason?? The fishes need to copulate??unless the copulation of fish, they cannot produce eggs from secondary spermatocytes??? 🤔🤔isn't it??

[@vanessabroker4182]

Very good overview, it is really helpful! But isn't it a MEIOTIC arrest in prophase I of the primary oocytes after birth? You wrote "mitotic" and now I am confused..

[@deepshikhayadav4999]

hi dear you are right, the arrest occurs after diplotene phase of prophase 1 of meiosis 1. During this arrested phase of development, the primary oocyte is surrounded by a layer of follicle cells and the oocyte along with the follicle cells is termed as primordial follicle. This primordial follicle further begins to develop and gets surrounded by multiple layers of follicle cells known as granulose cells, the oocyte also develops a thick ZONA PELLUCIDA layer and a basal lamina to separate it from the other cells in the ovary. So don't get confused I hope I cleared your doubt. Also meiosis 1 will get completed only when puberty hits and by the stimulation of the gonadotropins (Leiutinizing hormone and follicle stimulating hormone) which stimulate ovulation. The process of ovulation will then trigger the completion of meiosis 1 and finally the formation of the first polar body and secondary oocyte which will then undergo meiosis II to develop into a mature egg and second polar body. I really hope this helps :)

[@worldmindgames1183]

Hi sir , thnx for this videos, itz really helped me for my study more accurately. But please I have a request , please make a special video of NEET EXAMINATION, how to focused on main points or thats type of topic . Thnx sir ,

[@shomusbiologyofficial]

+Ayan Ayan Saha Saha I was preparing the series for NEET

[@sreejaramachandran4732]

Sooper teaching

[@ralphrober3025]

thank u sar...

[@sumaiyfatima308]

Very niceee ...

[@PratikPatel244644]

one QUESTION "Why sperm is not acting as an antiboby in female reproducting system during coupling ?"

[@razaakhtar38]

not antibody... it acts like antigen.!!

[@MalaySahasrabudheknightfury]

I have watched a video un that they said that there are some bodies who trap the sperms but the quantity if sperms is huge which cause fertilization to occur

[@sanyuktaist]

ESCs are pluripotent, not Totipotent.

[@smaranikakar281]

Thank you sir..its really helpfull...

[@shomusbiologyofficial]

You're welcome

[@yasodharabal6806]

Tq sir....

[@amruthamavily]

thank yew sir

[@rajibnamasudra2687]

first time I found your lecture boring. u made it very lenghty

[@sreejaramachandran4732]

Xllent sir

[@ramezal-khalaf9834]

awesome video .. I just noticed one thing .. spermatogonium is singular and spermatogonia is plural and the same for oogonium and oogonia but still thank you for this video .. good job :)

[@mayurbiotech1657]

ramez al-khalaf yes u r right

[@Fit_boy_suman]

Sir during spermatogenesis a man produces huge numbers of sperm in their life cycle and they have similar gene sequences similarly incase of women they releases total oocyte in their life cycle during menstruation are also similar in their gene sequences so why the first offspring and second offspring (except identical twins) shows genetic and morphologic variation even they were produced From same gene combination? Sir এটা কেন হচ্ছে যদি clearly bolen toh khub valo hai🙏🥰

[@saikumar-kn6kc]

xlent sir

[@tanviagrawal2746]

the formation of spermatids is by meiotic division 1 and 2...didn't expect this mistake from u😞

[@susamasing6577]

Satti asadharan vedio ..sirrr

[@shomusbiologyofficial]

Thank you

[@aishwaryalohade3913]

thank you sir

[@shomusbiologyofficial]

You're welcome

[@chinthakayalabharathchinth7593]

Tq sir

[@shomusbiologyofficial]

You're welcome

[@priyambadadas3121]

ITS spermatogonium is singular and spermatogonia is plural

[@arnabsen8985]

correct the spelling of "Mamals" in the title.

[@meerreyaz1234]

Sorry sir primary spermatocytes first changes into secondary spermatocytes

[@gamerprince-tl5hg]

That part doesn't seem to be important. It's not in my notes. It says that it goes straight from primary to 4 haploid spermatids

[@abhaysingh8345]

Yea, by meiosis, Both mitosis and meiosis happens in process of spermatogenesis

[@aaditya6312]

Is it meiotic arrest or mitotic arrest??

[@marfeen1284]

mitotic arrest

[@marfeen1284]

because meiosis only occur when both different gametes fuse to form New one

[@shafac6215]

Priya Negi it is meiotic arrest , as he also said mitotic prophase 1, whereas there is no prophase 1 n 2 in mitosis

[@princecreation3147]

Legend are watching after 7years❤️

[@shomusbiologyofficial]

Thank you

[@heyy_tany_]

Ultra legends watching after 10 yrs❤

[@zoologylectureswithmasood1015]

Long live sir g

[@shomusbiologyofficial]

Thank you

[@kruzzlazz5036]

why do u have headphones on >

[@ayushshah7592]

+Kruzz Lazz so that you can hear it clearly....

[@lokanathmishra2217]

Primary spermatocytes matuers to secondary spermatocytes.

[@shomusbiologyofficial]

Yes

[@ahmedmosadalameldin3135]

Ium = singular Ia = plural + You forgot about secondary spermatocyte :(

[@MelomaniacEarth]

100 th comment

[@shomusbiologyofficial]

Thank you

[@MJ-xc5zr]

Sir ne padhaya to badhiya h magar mic ke sath m headphone kyu pehne hai 😂

[@shomusbiologyofficial]

Check the date of the upload. You didn't even know about KZbin then

[@MJ-xc5zr]

@@shomusbiologyofficial arre sir i am just jocking muje pta h aap abhi boht pragatee kar chuke he don't be serious By the way big fan 🌹🌹

[@meghrajchude5717]

why u r using Arrest Encounter like this words are You.police or Biologist #Just kidding great perform

[@MalaySahasrabudheknightfury]

Sometimes for a person it is difficult to speak in languages like English... I also face the same problem during seminars..

[@asharenukaswamy6392]

he is confused