GENETICS
VOCABULARY
REVIEW
Please take out your
agenda, science
journal, and turn in
any missing work into
the late basket.
DEFINITIONS TO REVIEW
Phenotype - An organism’s physical appearance or visible traits. What can
be seen. (ex: freckles, curly hair)
Genotype - An organisms genetic makeup or allele combination. What can
not be seen. (ex: AA, Aa, aa)
Allele – 2 forms of a gene, 1 from each parent. (ex: AA, Aa, aa)
Allele = Alphabet
YEAH, MORE DEFINITIONS TO REVIEW
Heterozygous - having two different alleles for a
particular trait, one dominant and one recessive. (Aa)
Homozygous – having the same 2 alleles for a particular trait,
both dominant or both recessive. (AA or aa)
YEAH, EVEN MORE DEFINITIONS TO REVIEW
• Dominant Trait – a trait that is expressed or shown. The alleles that
determine dominant traits are either heterozygous (one dominant
allele and one recessive allele = Aa) or homozygous dominant (both
dominant alleles = AA).
• Recessive Trait – a trait that is in our genes but is not expressed or
shown. It can be passed on to future generations. The alleles that
determine recessive traits are always homozygous recessive (both
recessive alleles = aa).
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