NAME:______________________________________________________________ DATE:_____________ PERIOD:___________
GENETICS & HEREDITY STUDY GUIDE
Define the following terms:
Gene-
Dominant allele-
Recessive allele-
Incomplete dominance-
Codominance-
Genotype-
Phenotype-
Homozygous dominant genotype-
Homozygous recessive genotype-
Heterozygous genotype
Explain why an organism receives two alleles for each trait.

Explain the difference between “GENOTYPE” and “PHENOTYPE.”

Be able to identify possible phenotypes when given genotypes.

If a crazy creature has MOUSE EARS and that trait is determined by a RECESSIVE ALLELE, how would you write
the GENOTYPE? (assume alleles are represented with “T” and “t”)

If a crazy creature with a KNOB ANTENNA SHAPE (Tt) mated with a crazy creature who had a STAR ANTENNA
(tt), what are the probabilities of them having an offspring with the PHENOTYPES listed below?
Complete the PUNNETT SQUARE to show your work.
Possible GENOTYPES: ___________________
Possible PHENOTYPES: __________________
PROBABILITIES – write as a fraction or a percentage
KNOB: __________________
STAR: __________________