2017 DSE Bio 討論區(2)

How to test or prove the character is sex linked ？

2016 DSE MC Q12-13


2016 DSE MC Q24-25



2016 DSE MC Q27


2016 DSE MC Q35-36

2016 DSE MC Q12-13


2016 DSE MC Q24-25



2016 DSE MC Q27


2016 DSE MC Q35-36

27有冇人可以解釋下

2016 DSE MC Q12-13


2016 DSE MC Q24-25



2016 DSE MC Q27


2016 DSE MC Q35-36

27有冇人可以解釋下

B 錯 enzyme denatured at high temperature and inactivated in low temp
利申：2016 5**

How to test or prove the character is sex linked ？

How to test or prove the character is sex linked ？

I think it would be more helpful if you can think it through by yourself. See if you can try out the following question:

2011 AL Paper 2 Q.1(d)
In a family of four, both the father and the mother are normal but both their son and daughter suffer from a genetic disease. Without using genetic diagrams,
(i) deduce whether the genetic defect is a dominant trait or a recessive trait. (4 marks)
(ii) deduce whether the gene for the genetic defect is located on the X-chromosome. (4 marks)

我想問下ultrafiltration 既glomerulus filtrate 點解冇lipid既？定係lipid太大柆過唔到？

Liver做完detoxification係咪將d urea 先運去heart然後先到kidney?

我想問下ultrafiltration 既glomerulus filtrate 點解冇lipid既？定係lipid太大柆過唔到？

Because the lipid is not present in the form of triglyceride or cholesterol in plasma they are transported by binding to proteins such as albumin and lipoproteins so proteins are too large

oxygen dept有咩好處？

我想問下ultrafiltration 既glomerulus filtrate 點解冇lipid既？定係lipid太大柆過唔到？

Because the lipid is not present in the form of triglyceride or cholesterol in plasma they are transported by binding to proteins such as albumin and lipoproteins so proteins are too large

is that out-c ?

其實" putrefaction" or " ammonifiation" 過程會放CO2 嗎？

係 全中
你概念ok 了

但第一次減數分裂之後既2個子細胞中既染色體，一條係來自母親，另一條係來自父親，點解唔係2套既？
唉，呢課d野好抽象

因為經過第一次減數分裂，
-> 同源染色體分離
-> 留低姐妹染色單體
-> 你其實細心諗，姐妹染色單體咪即係未變身前既父系或母系染色質
-> 所以我地就會話佢得「一份/一套」染色體 N

最簡單諗：
1. 得番父系/母系既姐妹染色單體

兩套指： 父系 母系兩款「結構遺傳上不同」既染色體

而姐妹染色單體係：結構上/遺傳上相同一樣既複製品

多謝巴打，幫我清左好多概念
想問下，同源染色體配對個下，係咩玩法？
係父系染色體同父系染色體配對，母系染色體同母系染色體配對，定母系同父系染色體配對，又或者系隨機配對？

同源染色體配對；

父系染色體(2條父系相同染色單體)與 母系染色體(2條母系相同染色單體) 一齊「排一齊」

配對還配對：指兩條染色體「一齊排」

但「點樣配對」：out c(我都唔太識）
好似有機制令父/母系染色體自己識別「長度差唔多」既另一同伴(父/母系染色排）
-> 唔係隨機胡亂配

但「點樣排列於赤道/23組同源染色體邊個排前邊個排後」：每一次、每一次減數分裂都唔同。換句話說即係「任意」排列

但第一次減數分裂之後既2個子細胞中既染色體，一條係來自母親，另一條係來自父親，點解唔係2套既？
唉，呢課d野好抽象

因為經過第一次減數分裂，
-> 同源染色體分離
-> 留低姐妹染色單體
-> 你其實細心諗，姐妹染色單體咪即係未變身前既父系或母系染色質
-> 所以我地就會話佢得「一份/一套」染色體 N

最簡單諗：
1. 得番父系/母系既姐妹染色單體

兩套指： 父系 母系兩款「結構遺傳上不同」既染色體

而姐妹染色單體係：結構上/遺傳上相同一樣既複製品

多謝巴打，幫我清左好多概念
想問下，同源染色體配對個下，係咩玩法？
係父系染色體同父系染色體配對，母系染色體同母系染色體配對，定母系同父系染色體配對，又或者系隨機配對？

同源染色體配對；

父系染色體(2條父系相同染色單體)與 母系染色體(2條母系相同染色單體) 一齊「排一齊」

配對還配對：指兩條染色體「一齊排」

但「點樣配對」：out c(我都唔太識）
好似有機制令父/母系染色體自己識別「長度差唔多」既另一同伴(父/母系染色排）
-> 唔係隨機胡亂配

但「點樣排列於赤道/23組同源染色體邊個排前邊個排後」：每一次、每一次減數分裂都唔同。換句話說即係「任意」排列

Sorry啊，仲係唔係好明
個排法 係咪姐係
父 父
母 母

咁排法？ 定抑或係
父 母
父 母
咁排？

因為經過第一次減數分裂，
-> 同源染色體分離
-> 留低姐妹染色單體
-> 你其實細心諗，姐妹染色單體咪即係未變身前既父系或母系染色質
-> 所以我地就會話佢得「一份/一套」染色體 N

最簡單諗：
1. 得番父系/母系既姐妹染色單體

兩套指： 父系 母系兩款「結構遺傳上不同」既染色體

而姐妹染色單體係：結構上/遺傳上相同一樣既複製品

多謝巴打，幫我清左好多概念
想問下，同源染色體配對個下，係咩玩法？
係父系染色體同父系染色體配對，母系染色體同母系染色體配對，定母系同父系染色體配對，又或者系隨機配對？

同源染色體配對；

父系染色體(2條父系相同染色單體)與 母系染色體(2條母系相同染色單體) 一齊「排一齊」

配對還配對：指兩條染色體「一齊排」

但「點樣配對」：out c(我都唔太識）
好似有機制令父/母系染色體自己識別「長度差唔多」既另一同伴(父/母系染色排）
-> 唔係隨機胡亂配

但「點樣排列於赤道/23組同源染色體邊個排前邊個排後」：每一次、每一次減數分裂都唔同。換句話說即係「任意」排列

Sorry啊，仲係唔係好明
個排法 係咪姐係
父 父
母 母

咁排法？ 定抑或係
父 母
父 母
咁排？

其實" putrefaction" or " ammonifiation" 過程會放CO2 嗎？

上網搵唔到任何資料...
但ce mc 話呢個過程會放CO2....

How to test or prove the character is sex linked ？

I think it would be more helpful if you can think it through by yourself. See if you can try out the following question:

2011 AL Paper 2 Q.1(d)
In a family of four, both the father and the mother are normal but both their son and daughter suffer from a genetic disease. Without using genetic diagrams,
(i) deduce whether the genetic defect is a dominant trait or a recessive trait. (4 marks)
(ii) deduce whether the gene for the genetic defect is located on the X-chromosome. (4 marks)

(i )Son has genetic disease so he must bear at least one allele for genetic disease which is inherited from either mother or father.
So at least one of parents must bear one allele for genetic disease. Both parents are normal so they must bear at least one allele for normal condition. Thus at least one of parents is heterozygous, dominant character is expressed under heterozygous condition. Therefore , normal condition is dominant trait while genetic defect is recessive trait.

(ii) father has only one X chromosome and it will be inherited to his daughter. Mother will inherit her one of X chromosome to her daughter too.
The daughter has genetic defect so she must have homozygous recessive trait with bearing two recessive allele for genetic defect on both her X chromosomes. So recessive allele is located on X chromosome.