Welcome Scientists! DQ: What does it mean if two species have a common ancestor? What do ancestors pass on to offspring? Today: 1.Complete: Your Inner Fish (if needed) 2.Traits! – a review of basic genetics concepts 3.Zork Genetics

Observing Phenotypes Complete “An Inventory of My Traits

Some vocabulary Your height or any other physical traits we can observe is called your phenotype The genes you have that cause a trait to look the way is does is called your Genotype

Genes The sections of DNA that code for specific traits Genes can be Dominant – trait always shows up if the gene is present. The gene shows its specific trait even if only one parent passed the gene to the child Recessive – trait is masked if the dominant gene is present. Gene shows its specific trait only when both parents pass the gene to the child.

An Inventory of My Traits Complete the first page Complete a data table for the entire class – not just your group as it says in the directions – Mrs. Ellis will help with this

4 th period5 th period6 th period7 th periodTOTALS TRAITYESNOYESNOYESNOYESNOYESNO Detached earlobes Tongue rolling Dimples Right-handed Freckles Naturally curly hair Cleft chin Allergies Cross left thumb over right See the colors red and green Have a straight hair line

Based on the data, which traits do you think are dominant or recessive? TRAITDominant or Recessive? Detached earlobesdominant Tongue rollingdominant Dimplesdominant Right-handeddominant Frecklesdominant Naturally curly hairdominant Cleft chindominant Allergiescomplicated Cross left thumb over right Complicated 55% Left over right 45% right over left See the colors red and green Recessive but complicated Have a straight hair linerecessive Detached = D Attached = d Rolling = R No rolling = r Dimples = I No dimples = i Right handed = H left = h Freckles = F no freckles = f Curly = C not curly = c Cleft chin = T no cleft = t Widow’s peak = W straight hairline = w

Create a bar graph Make sure to include both possible phenotypes!

Zork Genetics TraitDominantRecessive Height Hair color Number of eyesOneThree Number of fangsOneTwo Number of hornsTwoOne Lip color Number of wingsTwoNone Number of legsOneTwo Skin color Eyebrow thicknessThickThin