Die diagram hieronder toon die rangskikking van twee pare homologe chromosoom in 'n sel wat meiose ondergaan - NSC Life Sciences - Question 3 - 2017 - Paper 2
Question 3
Die diagram hieronder toon die rangskikking van twee pare homologe chromosoom in 'n sel wat meiose ondergaan.
1. Noem TWEE eienskappe van homologe chromosoom.
2. I... show full transcript
Worked Solution & Example Answer:Die diagram hieronder toon die rangskikking van twee pare homologe chromosoom in 'n sel wat meiose ondergaan - NSC Life Sciences - Question 3 - 2017 - Paper 2
Step 1
Noem TWEE eienskappe van homologe chromosoom.
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Answer
'n Chromosoompaar wat dieselfde lengte het.
Dra gene vir dieselfde eienskappe.
Step 2
Identifiseer strukture A.
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Answer
Spoelvel.
Step 3
Hoeveel van ELK van die volgende is in die diagram teenwoordigheid?
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Answer
(a) 8 chromatiede.
(b) 4 sentromere.
Step 4
Teken 'n benoemde diagram en toon EEN van die selle wat aan die einde van telofase I gevorm sal word.
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Answer
Diagram moet telofase I van meiose vertoon, met voorbeelde van homologe chromosoompaaie, en korrek gemerk wees.
Step 5
Gee die genotipe van die:
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(a) Individu verteenwoordiging in die diagram.
Genotipe is RrTt.
(b) moontlike gamete wat die gevolg kan wees van die rangskikking van allele wat in die diagram verteenwoordig word.
Gametetipes sluit in: RT, rt.
Step 6
Bepaal die genotipes en fenotipes van hulle ouers deur 'n genetiese kruising te doen.
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Answer
Ouers se genotipes is I<sup>A</sup>I<sup>B</sup> (AB) en ii (O).
Fenotipes is bloedgroep AB en bloedgroep O.
Step 7
Identifiseer die tegniek wat hierbo getoon word.
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Die tegniek is DNA-profilerings/profielsamestelling.
Step 8
Watter man is die biologiese vader van die kind?
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Man 3.
Step 9
Verduidelik jou antwoord op VRAAG 3.2.
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Die bande van die kind se DNS/DNA is 'n kombinasie van die DNS/DNA van elke ouer. Die oorblyfende drie bande stem ooreen met die man van Man 3.
Step 10
Noem TWEE ander gebruike van hierdie tegniek.
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Om misdade te ondersoek/dispute op te los.
Om organismes vanaf hulle oorsprong te identifiseer.
Step 11
Wat word die proses genoem waar koringplante deur die inplant van gene verander word?
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Noem EEN ander nadeel van die gebruik van insektedoders.
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Kan ander nuttige insekte doodmaak.
Step 13
Noem TWEE maniere waarop wetenskaplikes die geldigheid van hierdie ondersoek kon verbeter het.
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Gebruik dieselfde veld/kwekkenhuis.
Gebruik dieselfde aantal plante.
Step 14
Wat was die oesopbrengs, in ARBITRÊRE eenhede, van koringplante sonder die insekte-doder-geen wat in 'n kweekhuis laat groei is?
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50%.
Step 15
Bereken die verskil in opbrengs tussen die koring met die insekte-doder-geen en die koring sonder die insekte-doder-geen wat in 'n landery laat groei is. Toon ALLE berekeningen.
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Verskil in opbrengs: (70 - 45) = 25.
Step 16
Beskryf die werking in resultate vir die koring met die insekte-doder-geen is in 'n kweekhuis laat groei en die koring in 'n landery laat groei is.
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Die toestande in die kweekhuis kan gekontrolleer word terwyl daar baie variasies in toestande in die veld kan voorkom.
Step 17
Stel EEN moontlike rede voor die verskil beskryf in VRAAG 3.6.
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Die omgewingstoestand kan verskil.
Step 18
Gee TWEE maniere waarna boere kan kyk in die verbouing van plante.
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