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Monohybrid Crosses: Inheritance of single genes Features to question look for General format: • Example: Genotype of individual 1 Genotype of individual 2 • Mendel crosses a heterozygous tall pea plant with a short pea plant. If tall is dominant to short, what is the genotype & phenotype ratio of the F1 generation? Explains dominance What you’re looking for Solution 1. Use a let statement to show which traits are dominant and recessive. Let T = tall, t = short Use the first letter of the dominant trait! Capital = dominant, lowercase = recessive 2. Determine the genotypes of the parents. Individual 1: heterozygous tall: Tt Individual 2: short: tt Means 2 different alleles! Recessive in this case, so it must be 2 lowercase letters 3. Draw a Punnett Square, as you learned in the handout and fill it in T t t Tt tt t Tt tt 4. Answer the question: Phenotype ratio is 2 Tall : 2 short Genotype ratio is 2 Tt : 2 tt Remember: it means letters/alleles Remember: it means physical appearance