Die diagramme hieronder toon twee fases van meiose - NSC Life Sciences - Question 3 - 2020 - Paper 1
Question 3
Die diagramme hieronder toon twee fases van meiose.
Diagram 1
Diagram 2
3.1.1 Identifiseer deel A.
3.1.2 Identifiseer die fase wat deur diagram 1 voorgestel word... show full transcript
Worked Solution & Example Answer:Die diagramme hieronder toon twee fases van meiose - NSC Life Sciences - Question 3 - 2020 - Paper 1
Step 1
Identifiseer deel A.
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Die deel A is die sentriolen.
Step 2
Identifiseer die fase wat deur diagram 1 voorgestel word.
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Die fase wat deur diagram 1 voorgestel word, is anafase.
Step 3
Beschryf die gebeurtenisse in die fase voor eid deur diagram 2 voorgestel word.
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In die fase wat deur diagram 2 voorgestel word, is die chromosoomverdeling aan die gang. Elke kromosoom word geskei in twee chromatiede, wat na teenoorgestelde polen getrek word.
Step 4
Noem die proses wat veroorsaak dat die chromosoom 'n kombinasie van gene het, soos in die diagram voorgestel.
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Die proses wat hierdie kombinasie van gene veroorsaak, is oorkruising.
Step 5
Gee EEN rede waarom die proses in VRAAG 3.4 genoem word.
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Dit is genoem omdat die uitwisseling van genetiese materiaal 'n belangrike stap in die genetiese variasie en evolusie is.
Step 6
Indien hindernis 'n menslike sel is, hoeveel chromosoom so tydens die fase in diagram 1 voorgestel is, te wees.
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In 'n menslike sel is daar normaalweg 46 chromosomen, wat beteken dat 23 pare teenwoordig is.
Step 7
Identifiseer deel D.
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Deel D is die serviks.
Step 8
Noem EEN funksie van deel A.
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EEN funksie van deel A is om eierselle te produkte.
Step 9
Beschryf die proses van ogenesese soos wat dit in deel B plaasvind.
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In deel B vind die ontwikkeling van eierfolikels plaas, wat lei tot die voortplanting van gesonde eiers.
Step 10
Noem EEN manier waarop struktuur C vir sy funksie tydens swangerskap geskik is.
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Struktuur C is geskik omdat dit die endometrium versterk, wat noodsaaklik is vir die bevestiging van 'n bevrugte eier.
Step 11
'n Persoon ondersoek 'n chirurgiese operasie op deel B aan beide kante te wijden. Verdudelik waarom hierdie persoon nie sal menstrueer nie.
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Hierdie persoon sal nie sal menstrueer nie omdat die chirurgiese prosedure die hormonale meganismes wat menstruasie reguleer, beïnvloed.
Step 12
Identifiseer die afhanklike veranderlikes in hierdie ondersoek.
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Die afhanklike veranderlik in die ondersoek is die spermtelling.
Step 13
Meet die spermtelling.
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Die spermtelling moet stadig gemeet word na behandeling, om die effektiwiteit van TU te evalueer.
Step 14
Noem TWEE ander faktore wat indruk maak, wanneer vrugtagers geskik is.
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Twee ander faktore is: dieet en oefening.
Step 15
Verdudelik hoe die TU vrugbaarheid beheers.
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TU inhibeer die afskeiding van testosteroon, wat die produksie van gesonde sperms kan beïnvloed.
Step 16
Die hoger temperatuur/drukking op die testes as gevolg van die sitwy onderkies.
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Hoër temperature kan die spermtelling en spermmotiliteit verlaag.
Step 17
Om te bepaal of TU nog effekties is na 12 maande.
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Dit is belangrik om die effek van TU op spermtelling na 12 maande te evalueer.
Step 18
Om te sien of die spermtelling terugkeer na normaal as die behandeling gestaak word.
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Na die beëindiging van die behandeling moet die spermtelling volg verifieer om herstel te bepaal.
Step 19
Geen sperms sal veroordeel word vanaf die epididimus na die uretra nie.
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Dit lei tot 'n afname in die spermtelling in die uretra.
