IB DP Biology: HL復(fù)習(xí)筆記10.2.3 Gene Linkage
Exceptions to Mendel's Rules NOS: Mendel used observations of the natural world to find and explain patterns and trends Since Mendel, scientists have looked for discrepancies and asked questions ba...
IB DP Biology: HL復(fù)習(xí)筆記10.2.2 Skills: Analysing Dihybrid Crosses
Predicting Phenotypic and Genotypic Ratios Worked Example Fruit flies (Drosophila melanogaster) were crossed in a laboratory study looking for inheritance patterns for two characteristics, wing len...
IB DP Biology: HL復(fù)習(xí)筆記10.2.1 Unlinked Genes
Independent Assortment & Segregation Unlinked genes segregate independently as a result of meiosis Unlinked genes?are genes that an organism carries on?separate chromosomes Not on homologous co...
IB DP Biology: HL復(fù)習(xí)筆記10.1.5 Skills: Drawing Chiasmata
Drawing Chiasmata Skill: Drawing diagrams to show chiasmata formed by crossing over Drawing tips Use two coloured pens/pencils to show chromosomes/chromatids of maternal or paternal origin One chro...
IB DP Biology: HL復(fù)習(xí)筆記10.1.4 Meiosis II
Meiosis II Second division of Meiosis : Meiosis II There is?no interphase between meiosis I and meiosis II?so the DNA is not replicated The second division of meiosis is almost identical to the sta...
IB DP Biology: HL復(fù)習(xí)筆記10.1.3 Meiosis I
Meiosis I Homologous chromosomes separate in meiosis I Prophase I DNA has already replicated and?condenses?and?becomes visible?as chromosomes Each chromosome consists of two sister?chromatids?joine...
IB DP Biology: HL復(fù)習(xí)筆記10.1.2 Crossing Over
Crossing Over Crossing over is the exchange of DNA material between non-sister homologous chromatids Meiosis has several mechanisms that?increase the?genetic diversity of gametes?produced Both?cros...
IB DP Biology: HL復(fù)習(xí)筆記10.1.1 The Process of Meiosis
Replication of Chromosomes Like mitosis, meiosis is preceded by DNA replication Like most other eukaryotic cells, gamete-producing cells perform a?cell cycle Gamete-producing cells are found in the...
IB DP Biology: HL復(fù)習(xí)筆記9.4.4 Skills: Investigating Factors Affecting Germination
Experiments Investigating Factors Affecting Germination Seeds remain?dormant?long enough to allow seed dispersal or until conditions are favourable During dormancy the seed is unable to germinate a...
