DSE 生物BIOLOGY 區
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Essay 出咗咩
等bio mc ans
genetic disease, pure-bred vs hybrid
想睇E3問咩
Explain why genetic diseases are often carried in recessive alleles
然後問點解純種貓狗比起混種更大機會有genetic disease
然後問點解純種貓狗比起混種更大機會有genetic disease
Essay question
Nowadays, keeping pet (such as dogs and cats) is becoming popular in Hong Kong. Some people prefer pure-bred pets to hybrid pets. However, pure-bred pet usually have higher risks of suffering from genetic diseases than hybrid pet because of the way they are bred. Pure-bred pets are produced by crossing close relatives to keep a pure bloodline. Explain why genetic diseases are often carried by recessive allele. By comparing the effects of the two breeding processes on the genetic composition in the offspring, discuss why pure-bred pets are at a higher risk of suffering the genetics disease than hybrid pet. (11 marks)
應該冇抄錯
Nowadays, keeping pet (such as dogs and cats) is becoming popular in Hong Kong. Some people prefer pure-bred pets to hybrid pets. However, pure-bred pet usually have higher risks of suffering from genetic diseases than hybrid pet because of the way they are bred. Pure-bred pets are produced by crossing close relatives to keep a pure bloodline. Explain why genetic diseases are often carried by recessive allele. By comparing the effects of the two breeding processes on the genetic composition in the offspring, discuss why pure-bred pets are at a higher risk of suffering the genetics disease than hybrid pet. (11 marks)
應該冇抄錯
推到有ans
薯仔果題個X 係乜春
Starch granules
幾有趣
一樣
巴打可唔可以影埋E3
答Genetic variation？
有無人有1a mc 答案
解題在於明唔明白條defect gene 喺dominant allele 同 recessive allele 對於個individuals survival rate 嘅影響
Recessive 唔會be expressed, 對於individual survival rate 冇太大影響，所以可以正常grow and reproduce
而條recessive allele carrying defect gene 就可以pass 比下一代啦
Dominant allele 就相反，只要個individual 未生仔前死咗就pass 唔到條allele 比progeny ，所以最終會喺population 當中消失
咁pure-bred 同 hybrid 分別就應該大家都好熟啦
Recessive 唔會be expressed, 對於individual survival rate 冇太大影響，所以可以正常grow and reproduce
而條recessive allele carrying defect gene 就可以pass 比下一代啦
Dominant allele 就相反，只要個individual 未生仔前死咗就pass 唔到條allele 比progeny ，所以最終會喺population 當中消失
咁pure-bred 同 hybrid 分別就應該大家都好熟啦
唔係問structure 咩
Explain why genetic diseases are often carried by recessive allele
唔係應該由點解個病多數係recessive allele呢個位講咩？
Survival chance都唔關事，都唔駛同dominant allele disease做比較
唔係應該由點解個病多數係recessive allele呢個位講咩？
Survival chance都唔關事，都唔駛同dominant allele disease做比較
我都係答survival rate
俾到盡可能都係兩分
俾到盡可能都係兩分
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