Genetics Vocabulary

different forms of a gene (ex. A or a)

• genotype
• phenotype
• allele
• recessive

trait that always shows up in the organism when the allele is present (ex. A)

• dominant
• recessive
• genotype
• phenotype

allele that is masked when a dominant allele is present (ex. a)

• recessive
• dominant
• genotype
• phenotype

having two identical allleles for a trait (ex. AA or aa)

• homozygous
• heterozygous

having two different alleles for a trait (ex. Aa)

• homozygous
• heterozygous

an organisms genetic makeup or allele combinations (ex. AA, Aa, aa)

• genotype
• phenotype

the physical traits that appear in an individual 

• genotype
• phenotype

the allele combination Aa is -

• homozygous dominant
• heterozygous
• homozygous recessive

the allele combination AA is - 

• homozygous dominant
• heterozygous
• homozygous recessive

the allele combination aa is -

• homozygous dominant 
• heterozygous
• homozygous recessive