Gregor Mendel
• When he planted the offspring seeds of purple flowered plants, he noticed that the flowers were purple and white.
• This lead to the question of “WHY?”.
Generations
• Parental Generation = P1
• Cross pollination of the P1 generation results in the F1 generation. F = Filial
• Cross pollination of the F1 generation results in the F2 generation.
Recessive vs. Dominant Traits
• Dominant = a trait that hides the presence of another trait for the same characteristic.
• Recessive = a trait that is hidden by the presence of another trait.
Free = Dominant
Attached = Recessive
The Law of Independent Assortment
• The factors for different characteristics are distributed to gametes independently.
It’s in your Genes
• A gene is a segment of DNA on a chromosome that controls a particular hereditary trait.
Geno. Vs. Pheno.
• Genotype is the genetic makeup of an organism.
• It is often written with letters such as TT, Tt, or tt.
Geno. Vs. Pheno.
• Phenotype is the external appearance of an organism.
• Such as Tall, Short, Green, Yellow
Hetero. Vs. Homo.
• “Homo” means the same
• “Hetero” means different
• Homozygous dominant : TT
• Heterozygous: Tt• Homozygous
recessive: tt
Probability
• The likelihood that a specific event will occur.
• It is expressed as a decimal, percent or fraction.
Probability
• Formula
# of times an event is expected to happen
# of opportunities for an event to happen
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