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Strive for DSE Bio5**✌️ (@dse_biology) Instagram Profile Photo dse_biology

Strive for DSE Bio5**✌️

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今日想講下一個關於f5下學期既topic-basic genetics,呢課有一個concept係好多學生都搞唔清楚既,佢叫Mendel's law of inheritance,相關既問題係2012年dse出過,但個題既performance比考評形容為poor,好多學生淨係識死背條law同9:3:3:1呢個ratio出黎,而唔能夠將條law apply落條題目個道,甚至有學生係連條law係咩都唔知。所以想籍今日呢個機會講講。 - I. Law of segregation /Mendel's first law - Segregation呢個字解分離,所以條law顧名思義係講某樣野會分開啦😂 講呢條law前想比你地睇下一幅genetic diagram - ➡️{見圖2} - 相信讀過呢課既你地都會做題目個陣畫過,但畫呢幅圖個陣有冇諗過點解紅色框左個部份gametes production要畫兩個:H 同埋h,而唔係淨係一個gamete:Hh呢?咁其實你畫既時候暗地裹已經有個假設係H同h會分開入左去兩個唔同既gametes,只係你自己冇留意到。而兩個allele分別入唔同gametes呢個動作就係law of segregation喇! - 根據Law of segregation,homologous chromosome will seperate from each other during first meiotic cell division,而by definition,allele = an alternative form of the gene occupying the same locus of homologous chromosome,因此by 上面條law ,each gametes formed has only one allele for particular gene(and one allele for each of all gene resulting in a haploid set of chromosome)亦即係話每個gamete只會有1 pair allele入面既其中一個,而唔會有哂兩個。 - 而後面再可以引伸既野就係,一個fertilized egg或者一個develop ge individual入面既個23 pair homologous chromosome有一半係由male gamete道黎,另一半就由female gamete提供。咁當然有d好特別既情況例如trisomy,會係其中一pair homologous chromosome fail to seperate during gametes formation ,導致fertilization之後會有其中一pair ge chromosome多左一條出黎(變左有三條chromosome),咁就會有問題發生喇,個個問題叫唐氏綜合症。 - 太多字一個post出唔哂,下次講埋second law😂姐係2012年個題要用到既law。 - 都係個句啦🙊,有興趣想每星期每個topic都有人咁鉅細無遺咁同你解釋,清concept既話可以搵我私補架😎小組會再平d,補習地點會係poly或者將軍澳區。詳情direct我啦😙

QM Zoological Society (@qmzoological_society) Instagram Profile Photo qmzoological_society

QM Zoological Society

Instagram Image by QM Zoological Society (@qmzoological_society) with caption : "Panthera tigris sumatrae, Jambi the Sumatran tiger at Edinburgh zoo. The Sumatran tiger is native to Sumatra island in I" at Edinburgh Zoo - 1698595227798724742

Panthera tigris sumatrae, Jambi the Sumatran tiger at Edinburgh zoo. The Sumatran tiger is native to Sumatra island in Indonesia in the genus Panthera. They’re the smallest of the tiger subspecies. They’re currently critically endangered and it’s estimated that only 400-500 are left in the wild, due to degradation of their habitats and poaching. But zoos across Europe have conducted a successful breeding programme to prevent their extinction. But it’s still an ongoing battle 🐯 #biology

Chemistry&Biology_official (@chemistry_biology_official) Instagram Profile Photo chemistry_biology_official

Chemistry&Biology_official

image by Chemistry&Biology_official (@chemistry_biology_official) with caption : "🌊🐧 In just a few short weeks I will be returning to the White Continent for another season of expeditions around the Ant" - 1698594211870631215
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🌊🐧 In just a few short weeks I will be returning to the White Continent for another season of expeditions around the Antarctic Peninsula. This is a land unlike any other and the closest thing to pristine I have ever encountered. Unfortunately the whales, seals, and penguins are facing an uncertain future and my hope is that more of Antarctica will be set aside as a marine reserve, further insulating this unique and priceless continent.🐧🌊@eyosexpeditions #Biology

image by @annikensorf with caption : "👩🏻‍🔬🐟😬#biology #laboratory"- 1698593889453441593
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👩🏻‍🔬🐟😬#biology

nutrinote_chiara (@nutrinote_chiara) Instagram Profile Photo nutrinote_chiara

nutrinote_chiara

Instagram Image by nutrinote_chiara (@nutrinote_chiara) with caption : "Allergie vs Intolleranze alimentari - parte I
Conosci le differenze?
L' #allergia è una reazione spropositata del sistem" at Puglia, Italy - 1698592826524613079

Allergie vs Intolleranze alimentari - parte I Conosci le differenze? L' è una reazione spropositata del sistema immunitario che si scatena quando il entra in contatto con un dato detto più propriamente ALLERGENE. La reazione è immediata: nell'arco di max 2 h si scatena la risposta immunitaria. È causata da , , , , ecc. Causa arrossamento della cute, prurito, dolori addominali, diarrea, difficoltà respiratorie e addirittura shock anafilattico. #biology

An embryo is an early stage of developmentof a multicellular diploid eukaryotic organism. In general, in organismthat reproduce sexually, an embryo develops from a zygote, the single cell resulting from the fertilization of the female egg cell by the male sperms cell. The zygote possesses half the DNA of each of its two parents. In plants, animals, and some protists, the zygote will begin to divide by mitosis to produce a multicellular organism. The result of this process is an embryo. And now I can see that embryo alive, I'm crying hardset, can't believe it and just can say Mashaallah.. • • • #biology @nasa

image by @bakeplancreate with caption : "I’ve been having a go at using my new iPad to write up my lecture notes. 📱✏️ I used the app Notability as it has a good "- 1698589442946014496
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I’ve been having a go at using my new iPad to write up my lecture notes. 📱✏️ I used the app Notability as it has a good range of ink colours and paper styles to use 🎨 I especially liked the zoom window which helps write smooth sentences 📝