1. Frayer Model
Vocabulary Review

2. Genotype
Definition: Set of alleles that an individual has for a character
Characteristics: pair of alleles, written as two letters, determines genotype, etc.
Examples: PP, Ee, tt
Non-examples: blue eyes, freckles, tall plant

3. Phenotype Definition: trait that results from an individual’s alleles
Characteristics: physical appearance/trait, visible, determined by genotype
Examples: blue eyes, freckles, tall plant
Non-examples: PP, Ee, tt

4. Dominant
Definition: expressed when allele is present in a genotype/individual
Characteristics: “wins” over other alleles, overshadows recessive allele, expressed, capital letter
Examples: brown eyes, freckles, dimples
Non-examples: blue eyes, no freckles, no dimples

5. Recessive
Definition: only expressed when dominant allele is not present
Characteristics: written as lower case letter, usually overshadowed, only expressed in homozygous condition
Examples: blue eyes, no freckles, no dimples
Non-examples: brown eyes, freckles, dimples

6. Homozygous
Definition: having two identical alleles for a characteristic
Characteristics: SAME, two dominant or two recessive
Examples: PP, tt
Non-examples: Bb

7. Heterozygous
Definition: having two different alleles for a characteristic
Characteristics: DIFFERENT, one dominant & one recessive
Examples: Bb
Non-examples: PP, tt