IB DP Biology: HL復習筆記3.3.5 Mutations & Disease
Causes of Mutations A?mutation?is a change in the sequence of base pairs in a DNA molecule They occur?randomly?and?continuously?to create new alleles of a gene Often only with a very small number o...
IB DP Biology: HL復習筆記3.3.4 Inheritance of Genetic Diseases
Causes of Genetic Disease A gene can affect a?phenotype?of an organism A gene codes for a single polypeptide The polypeptide affects the phenotype through a particular mechanism The phenotype of an...
IB DP Biology: HL復習筆記3.3.3 Skills: Inheritance
Constructing Punnett Grids A?monohybrid trait?is one that is controlled by only?one gene Generally, we consider that such a gene has?two alleles Either: one allele is dominant and the other is rece...
劍橋土地經(jīng)濟專業(yè)是什么專業(yè)？
作為世界頂尖學府之一的劍橋大學卻具有一個十分特殊且與經(jīng)濟相關(guān)的專業(yè)——土地經(jīng)濟。劍橋土地經(jīng)濟專業(yè)是什么專業(yè)？劍橋大學的土地經(jīng)濟是不少同學的夢想專業(yè)，但畢竟土經(jīng)每年只招60多個人。 劍橋·土地經(jīng)濟 Land Eco...
IB DP Biology: HL復習筆記3.3.2 Inheriting Alleles
Segregation of Alleles Meiosis is a form of?nuclear division?that results in the?production of?haploid?cells?from diploid cells During meiosis a diploid cell will?divide twice?to form?four haploid ...
IB DP Biology: HL復習筆記3.3.1 Inheritance
Mendel's Experiments Gregor Mendel?was an Austrian monk He was trained in mathematics and natural history at the University of Vienna In the mid-19th century, Mendel carried out breeding experiment...
IB DP Biology: HL復習筆記3.2.5 Skills: Meiosis
Drawing the Stages of Meiosis Cells undergoing?meiosis?can be observed and photographed using specialized microscopes The different stages of meiosis have distinctive characteristics meaning they c...
IB DP Biology: HL復習筆記3.2.4 Non-disjunction
Non-disjunction Non-disjunction?occurs when chromosomes fail to separate correctly during?meiosis This can occur in either anaphase I or anaphase II, leading to?gametes?forming with an?abnormal num...
IB DP Biology: HL復習筆記3.2.3 Genetic Variation
Genetic Variation & Meiosis Crossing over and random orientation promote genetic variation Having?genetically different offspring?can be?advantageous?for natural selection and therefore increas...
美國院校更新托福成績要求，多所院校提高了對申請者的托福最低要求！
在最新美國院校托福成績要求中，有部分院校提高了對申請者的托福最低要求。 加州大學伯克利分校和威斯康星大學麥迪遜分校都由無最低托福成績要求變更為托福成績不低于80分。另外從哥倫比亞大學官網(wǎng)獲悉：2023申請...
北京口碑較好的國際學校盤點！
隨著國際教育的不斷發(fā)展，越來越多孩子不想上公立學校，紛紛都將目光轉(zhuǎn)向了國際學校。但是想上好的國際學校，難度可比想象中的更大。口碑好的國際學校在考試入學的時候，有的學生錄取比例就在20:1以上，競爭非常...
英國學校面試要求，需要如何準備？
收到面邀也是來自學校的肯定，證明你的學術(shù)水平已經(jīng)超過許多對手了。面試中表現(xiàn)出的隱藏技能，也能直接提升申請成功率。這篇文章幫你解析英國學校面試要求，幫你充分準備穩(wěn)定發(fā)揮，助你把“有條件錄取”換成“無條件...
