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...
劍橋土地經濟專業是什么專業？
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濟相關的專業——土地經濟。劍橋土地經濟專業是什么專業？劍橋大學的土地經濟是不少同學的夢想專業，但畢竟土經每年只招60多個人。 劍橋·土地經濟 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...
