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Genetics Intro. Alleles. Different forms of a single gene For exaple -Hair color: red, brown, black, blonde. DOMINANT. CAPITAL LETTERS TT or Tt The trait observed when at least one dominant allele for a characteristic is inherited. Recessive. LOWERCASE LETTERS t t
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Alleles • Different forms of a single gene • For exaple-Hair color: red, brown, black, blonde
DOMINANT • CAPITAL LETTERS • TT or Tt • The trait observed when at least one dominant allele for a characteristic is inherited.
Recessive • LOWERCASE LETTERS • tt • A trait that is apparent only when two recessive alleles for the same characteristic are inhereted.
Phenotype (WORDS) • What an organisms looks like: • TALL or SHORT • Purple or Green
Genotype (LETTERS) • The inherited combination of alleles • RR, Rr, or rr • Heterozygous- Rr • Homozygous- RR or rr • We write using LETTERS