Ms. Frost  A world of biology.....
  • Welcome
    • Data bases for labs
    • IB Calendar
  • IB: Introduction to cells
    • Origin and Division of Cells
    • Membrane Structure and transport
    • Structure of DNA and RNA
    • DNA Replication
    • Transcription and gene expression
    • Translation
    • Genetic modification and biotechnology
  • Molecules to Metabolism
    • Molecular diagrams
    • Water
    • Carbohydrates and Lipids
    • Proteins and Enzymes
    • Lactase / Enzyme Inhibition
    • Cellular Respiration
    • Phases of Cellular Respiration
    • Earth atmosphere / Color
    • Photosynthesis
  • Digestion and absorption
    • The kidney and osmoregulation
    • Neurons and synapses
    • Muscle and Movement
    • The blood system
    • Gas exchange
    • Defense against infectious disease
    • Antibody production and vaccination
    • Hormones, Homeostasis
    • Sexual reproduction
  • Genetics and Genes
    • Chromosomes
    • Meoisis
    • Inheritance
    • MORE Inheritance
  • Evidence of evolution
    • Natural selection
    • Gene pools and speciation
    • Classification of biodiversity
    • Cladisitics
  • Ecology Species, communities and ecosystems
    • Energy Flow
    • Carbon Cycling
    • Climate change
  • Option C: Species and communities
    • Option C: Communities and ecosystems
    • Option C: Impacts of human on ecosystems
    • Option C: Conservation of biodiversity
  • Plants: Transport in the xylem of plants
    • Transport in the phloem of plants
    • Growth in plants
    • Reproduction in plants
  • Anatomy Language
    • Epithelial/Connective/Skeletal
    • Muscular / Nervous Tussue
    • Heart
  • Western Hills Website
  • Science in the News
  • World Population Clock

MORE Inheritance

 Understandings:
• Unlinked genes segregate independently as a result of meiosis.
• Variation can be discrete or continuous.
• The phenotypes of polygenic characteristics tend to show continuous variation.


• An understanding of inheritance allowed farmers to selectively breed their livestock for specific characteristics.
​• Aim 8: Ethical issues arise in the prevention of the inheritance of genetic disorders.
Application: Polygenic traits such as human height may also be influenced by environmental factors.
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Theory of knowledge:
The law of independent assortment was soon found to have exceptions when looking at linked genes. What is the difference between a law and a theory in science?

Application: Morgan’s discovery of non-Mendelian ratios in Drosophila.  
        Looking for patterns, trends and discrepancies—Mendel used observations of the natural world to find and explain patterns and trends. Since then, scientists have looked for discrepancies and asked questions based on further observations to show exceptions to the rules. For example, Morgan discovered non-Mendelian ratios in his experiments with Drosophila.
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lactase_pedigrees_patterns_inheritance_student.pdf
File Size: 908 kb
File Type: pdf
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lactase_patterns-in-the-distribution-of-lactase-persistence-student__2_.pdf
File Size: 890 kb
File Type: pdf
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Explore the pedigree of lactase persistence with data.  

​Use a world map to log data found worldwide for lactase persistence.

Application: Completion and analysis of Punnett squares for dihybrid traits.
Skill: Calculation of the predicted genotypic and phenotypic ratio of offspring of dihybrid crosses involving unlinked autosomal genes.
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• Chi-squared tests are used to determine whether the difference between an observed and expected frequency distribution is statistically significant.
Skill: Use of a chi-squared test on data from dihybrid crosses.
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Diversity and dihybrid crosses of snurfles!

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​• Gene loci are said to be linked if on the same chromosome.
​
Skill: Identification of recombinants in crosses involving two linked genes.



​Alleles are usually shown side by side in dihybrid crosses, for example, TtBb.
In representing crosses involving linkage, it is more common to show them as vertical pairs, for example:

This format will be used in examination papers, or students will be given sufficient information to allow them to deduce which alleles are linked

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  • Welcome
    • Data bases for labs
    • IB Calendar
  • IB: Introduction to cells
    • Origin and Division of Cells
    • Membrane Structure and transport
    • Structure of DNA and RNA
    • DNA Replication
    • Transcription and gene expression
    • Translation
    • Genetic modification and biotechnology
  • Molecules to Metabolism
    • Molecular diagrams
    • Water
    • Carbohydrates and Lipids
    • Proteins and Enzymes
    • Lactase / Enzyme Inhibition
    • Cellular Respiration
    • Phases of Cellular Respiration
    • Earth atmosphere / Color
    • Photosynthesis
  • Digestion and absorption
    • The kidney and osmoregulation
    • Neurons and synapses
    • Muscle and Movement
    • The blood system
    • Gas exchange
    • Defense against infectious disease
    • Antibody production and vaccination
    • Hormones, Homeostasis
    • Sexual reproduction
  • Genetics and Genes
    • Chromosomes
    • Meoisis
    • Inheritance
    • MORE Inheritance
  • Evidence of evolution
    • Natural selection
    • Gene pools and speciation
    • Classification of biodiversity
    • Cladisitics
  • Ecology Species, communities and ecosystems
    • Energy Flow
    • Carbon Cycling
    • Climate change
  • Option C: Species and communities
    • Option C: Communities and ecosystems
    • Option C: Impacts of human on ecosystems
    • Option C: Conservation of biodiversity
  • Plants: Transport in the xylem of plants
    • Transport in the phloem of plants
    • Growth in plants
    • Reproduction in plants
  • Anatomy Language
    • Epithelial/Connective/Skeletal
    • Muscular / Nervous Tussue
    • Heart
  • Western Hills Website
  • Science in the News
  • World Population Clock