genetics! the science of heredity. foundation of genetics monohybrid cross—single-trait cross...
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GENETICS!The science of heredity
Foundation of Genetics
• Monohybrid cross—single-trait cross
• Dihybrid cross—double-trait cross
Gregor Mendel• Father of genetics• Studied
inheritance in PEA PLANTS
F1 Results of One Monohybrid Cross
F2 Results of Monohybrid Cross
Flower Color: Mendel
• A = purple
• a = white
• Homozygous parent—AA or aa
• Heterozygous parent– Aa
• When A present flower will be purple (dominant allele)
Mendel’s Conclusions
• Genotype—the combination of alleles carried by an organism (AA, Aa, aa)
• Phenotype—observable traits of an organism (purple or white)
• Mendel was able to predict outcome of crosses• Punnett Square—tool to predict outcome of
crosses (genotype and phenotype)
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