Calculate allele frequency from genotype or phenotype numbers
Define allele in terms of DNA sequence
Define dominance in terms of alleles, DNA variants and protein variants
Vision and Change Core Concepts and Competencies (http://visionandchange.org)
Core Concept:
Structure and Function: Basic units of structure define the function of all living things.
Information Flow, Exchange, and Storage: The growth and behavior of organisms are activated through the expression of genetic information in context
Core Competencies:
Ability to use quantitative reasoning: Biology relies on applications of quantitative analysis and mathematical reasoning.
Ability to communicate and collaborate: Biology is a collaborative scientific discipline.
Biocore Guide (Brownell et al., https://doi.org/10.1187/cbe.13-12-0233)
Evolution: Mutations that change protein structure and/or regulation can impact anatomy and physiological function at all levels of organization.
Information Flow: Gene expression and protein activity are regulated by intracellular and extracellular signaling molecules. Signal transduction pathways are crucial in relaying these signals.
Information Flow: Organisms have sophisticated mechanisms for sensing changes in the internal or external environment. They use chemical, electrical, or other forms of signaling to coordinate responses at the cellular, tissue, organ, and/or system level.
Information Flow: Information stored in DNA is expressed as RNA and proteins. These gene products impact anatomical structures and physiological function.
Structure Function: The three dimensional structure of a molecule and its subcellular localization impact its function, including the ability to catalyze reactions or interact with other molecules. Function can be regulated through reversible alterations of structure e.g. phosphorylation.
Structure Function: Natural selection has favored structures whose shape and composition contribute to their ecological function.
Process of Science Skills, Pelaez, N, et al. “The Basic Competencies of Biological Experimentation: Concept-Skill Statements“ (2017). PIBERG Instructional Innovation Materials. Paper 4. http://docs.lib.purdue.edu/pibergiim/4
Observations
Apply systematic observations to discern variable properties of components of biological systems
Compare observations to existing knowledge, models, or theories
Hypothesis
Use a model (i.e. an abstraction or simplification: an equation, computer simulation, conceptual drawing, or other explanatory representation that shows key elements and their relationships) to generate new hypotheses.
Generate multiple explanations of the natural world that are testable and potentially falsifiable
Measurement
Choose appropriate measurements based on available equipment, population/species, natural variation, and research question(s)
Sampling
Identify a target population(s) (might be molecules, cells, organisms, or populations) for the planned experiment
Measurement
Record data in an organized and systematic way using appropriate tables, forms, etc.
Inferences and conclusions
Determine and articulate whether data support or refute hypotheses and predictions
Align conclusion with analyses, hypotheses, research question(s), and existing knowledge
Representations
Distill results into clear numeric and/or graphical forms that are aligned with the experimental objective/question/hypothesis
Dominant (in terms of genetics) means stronger and/or better; Recessive version is bad
Dominant (in terms of genetics) means more common; Recessive is rare
Dominance suppresses or overwhelms the recessive allele
Recessive means not expressed or not present
An allele is just a unit of inheritance (for example, B/b and no more).
“Gene” and “allele” are abstract concepts rather than physical entities
Two alleles are very different, code for different proteins
Genes code directly for traits/Proteins work in isolation
Phenotype frequency = allele frequency
Genes are sequences of DNA that code for a product
Two alleles may differ by one or a few nucleotides
The versions of the protein that are present are a result of the particular alleles that are present in the genome.
The dominant allele is the one whose associated phenotype is observed when the two alleles are present together. And nothing else.
None of the following can be predicted based on dominance: frequency, fitness, quality, usefulness to the organism
Both alleles may be expressed in the same cell
A trait is a complex outcome based on which alleles (of multiple genes) are present and how they are expressed.
Allele frequency can be calculated using HWE
Students may do the PTC taste test in class and check the allele frequencies with Hardy-Weinberg. They then take home PTC strips over Thanksgiving and test their family members or 10 unrelated people. If they did family, they had to make a pedigree and try to determine genotypes based on phenotypes and family relationships. If they did friends, they had to do Hardy-Weinberg calculations.
Brown, M. The Genetics of Taste: A High School Activity for Teaching Genetics and the Scientific Method. https://gsoutreach.gs.washington.edu/files/genetics_of_taste.pdf
HHMI BioInteractive. The Making of the Fittest: Natural Selection and Adaptation. https://www.hhmi.org/biointeractive/making-fittest-natural-selection-and-adaptation
Acknowledgement
This material is based in part upon work supported by National Science Foundation (NSF) grants 1432286 and 1432303. Any opinions, findings and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.
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