Genetics, Sex & Chemotype
Inheritance, variation, genotype and phenotype, sex expression, chemotype, genomic concepts, and trait interpretation.
Published lessons
These pages are organized here by subject. The permanent THC-ENC IDs remain stable behind the scenes even when a clearer display title is used.
DNA, Genes, Alleles, and Chromosomes
Explain how DNA sequence, genes, alleles, and chromosomes relate without treating a detected variant as a complete prediction of crop performance.
Diploidy, Meiosis, and Genetic Recombination
Trace chromosome segregation and recombination from a diploid parent to genetically variable haploid gametes and offspring.
Mendelian Inheritance and Its Limits
Use segregation ratios as testable models while recognizing linkage, incomplete penetrance, multiple loci, structural variation, and measurement error.
Quantitative Traits and Polygenic Inheritance
Explain continuous trait variation using multiple loci, environmental effects, linkage, and interactions rather than a single-gene story.
Heritability and Environmental Variance
Interpret heritability as a population- and environment-specific variance ratio rather than a permanent percentage of genetic control.
Genotype, Phenotype, and Phenotypic Plasticity
Separate inherited genotype from the phenotype expressed at a particular stage, place, treatment, and sampling method.
Genotype-by-Environment Interaction
Recognize and measure when genotypes respond differently across environments, including changes in ranking.
Cannabis Genome Structure and Repetitive DNA
Describe the chromosome-scale cannabis genome while accounting for assembly differences, repeat content, structural variation, and reference bias.
Population Structure in Hemp and Drug-Type Cannabis
Interpret population clusters, ancestry, gene flow, and market categories without converting legal or commercial labels into biological absolutes.
Cultivar, Strain, Line, Accession, and Clone
Use plant-genetic-resource terms precisely and attach each name to a reproducible biological unit.
Chemotype as a Measured Chemical Phenotype
Define chemotype from a qualified chemical sample and distinguish ratio class from absolute concentration, yield, and product effect.
THCAS, CBDAS, and Major Cannabinoid-Acid Synthases
Connect cannabinoid-acid synthase genotype and expression to chemical potential while accounting for linked paralogs, pseudogenes, and pathway limits.
Sex Chromosomes and Sex-Linked Markers
Explain the XX/XY framework in dioecious cannabis and use sex-linked assays as validated predictions rather than guarantees of floral phenotype.
Monoecy and Alternative Sexual Systems
Distinguish stable monoecious breeding systems, dioecy, and occasional intersex expression using separate genetic and floral observations.
Intersex Expression: Genetics, Development, and Stress
Document unexpected mixed sex expression without assuming that genetics, a single stress event, or cultural folklore is the proven cause.
Polyploidy and Chromosome-Doubling Claims
Evaluate polyploid plants with verified ploidy, matched controls, fertility tests, and replicated phenotype and chemistry rather than size or potency assumptions.
Epigenetics and Developmental Memory
Explain epigenetic regulation and developmental carryover while keeping cannabis-specific inheritance and reset claims within the available evidence.
Genetic Identity Testing and Marker Systems
Select and validate marker systems for the identity question, biological unit, reference set, and error tolerance.
Clonal Fidelity, Somatic Mutation, and Off-Types
Investigate clonal differences through identity, health, environment, development, and mutation evidence instead of assuming genetic degradation.
Genetic Claims, Naming Integrity, and Evidence Standards
Build claims from controlled identity, provenance, pedigree, genotype, phenotype, and chemistry while labeling uncertainty and conflicts.