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Talk the Talk:•Heredity•Trait•Gene•DNA•Chromosome
•Allele•Genotype•Phenotype•Heterozygous•Homozygous
Dominant and Recessive Traits•For each of our traits, we inherit one allele
from Mom and one from Dad. •One allele usually expresses itself (we can
see it) and the other remains hidden. The expressed allele is dominant and the allele we can’t see is recessive.
•Example: If curly tail is dominant to straight tail, a puppy who received a curly tail allele from its mother and a straight tail allele from its father will have a curly tail.
Human Traits
• No Widows Peak (W). Widow’s peak (w). My phenotype =
• Dimples (D). No Dimples (d). My phenotype =
• Freckles (F). No Freckles (f). My phenotype =
• Hand Cross Right Thumb Top (R). Left Thumb Top ( r ). My phenotype =
• Tongue Rolling (T). No Tongue Rolling (t). My phenotype =
• Free earlobe (E). Attached Earlobe (e). My phenotype =
Human TraitsTrait Class
Tally
Ratio Students
with Trait / Total
Students
Percent of
Students with
Trait
No Widow’s
Peak Widow’s Peak
Dimples
No Dimples Freckles
No Freckles
Right Thumb
Cross Left Thumb
Tongue Roller Non Tongue Free Earlobe Attached Earlobe
Make a graph of the class data for those expressing the recessive phenotype.
Make a graph of the class data for those expressing the dominant phenotype.
Conduct a Survey
•Work with a partner•Survey at least 20 people for traits that
were studied in class•People must agree to take part in your
survey
Trait Tally
Widow’s Peak
No Widow’s Peak
Dimples
No Dimples
Freckles
No Freckles
Right Thumb Cross
Left Thumb Cross
Tongue Roller
Non Tongue Roller
Free Earlobe
Attached Earlobe
Total Number of People Surveyed