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...
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...
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...
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...
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...
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...
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...
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...
Drawing the Internal Structure of Seeds A?seed?consists of several parts which can be shown in a labelled diagram Testa The seed coat Cotyledon?or?cotyledons The leaf or leaves of the embryo which ...
