Mendelian Genetics: Walkthrough

Section role: supports the 'Cracking the Mendelian Code' section while the teacher synthesizes student findings from the Bio-Glider breeding activity, formally defines genetic vocabulary, and demonstrates the Punnett Square method. Slides: (1) Title — 'Cracking the Mendelian Code: Understanding Inheritance'; (2) Mendel's Law of Segregation — bullet points: Gregor Mendel, 'factors' (alleles) separate during gamete formation, each parent contributes one allele, sets up the 3:1 ratio; (3) Key Genetic Vocabulary — bullets: define Allele, Gene, Genotype (e.g., AA, Aa, aa), Phenotype (e.g., High-Pitch, Low-Pitch), using Bio-Glider examples; (4) Dominant vs. Recessive Alleles — bullets: define dominant ('A', always expressed if present, like High-Pitch AoA), define recessive ('a', only expressed when homozygous, like Low-Pitch AoA); (5) Introducing Punnett Squares — visual: simple 2x2 grid, purpose of the tool; (6) Punnett Square Walkthrough: F1 Generation — example: 'AA' parent x 'aa' parent, show resulting 'Aa' offspring, link to disappearance of Low-Pitch trait observed in Section 2; (7) Punnett Square Walkthrough: F2 Generation — example: 'Aa' x 'Aa', show resulting 'AA, Aa, aa' genotypes and 3:1 phenotypic ratio (High-Pitch:Low-Pitch), link to reappearance of Low-Pitch trait observed in Section 2; (8) Genotype, Phenotype, and Drag — bullets: connect dominant 'A' allele to High AoA and more drag, recessive 'a' allele to Low AoA and less drag, explain how 'Aa' genotype expresses High AoA but carries 'a'; (9) Practical Application — prompt: 'How does understanding Punnett Squares help predict the traits of future Bio-Gliders?'. Closing slide: 'What hidden genetic code might a High-Pitch Bio-Glider carry, and why does it matter for its offspring?' — sets up the individual application in Section 4.

Lara from Teachy