Mrs Stewart Honors Biology. Pedigree Charts. What is a pedigree?. Pedigree Charts. Record ancestry and/or trace the geneology of a trait through the family lines. Genetic Testing Medical History Historical Data Family Records. Why do we use them?
Honors BiologyPedigree Charts
Record ancestry and/or trace the geneology of a trait through the family lines
Why do we use them?
Then what information do we use to determine inheritance of traits?
Sex-Linked Recessive Disorder
What are some clues that you can see in this pedigree that could tell you this is a sex-linked disorder?
Pam is Ann’s Grandmother
Which family members are Albino?
How is Ann related to Pam?
Inheritance Pattern: The transmission of genetically encoded traits/conditions/diseases to offspring
In other words: How the gene is transmitted/passed on.
Affects males/females equally
Pedigree may show carriers
There will not be carriers – those with the gene will be “affected”
Will probably not skip generations
Will affect males/females equally
More males affected than females
The ability to taste PTC (bitter) is inherited.
BB = strong bitter taster
Bb = somewhat able to taste bitter
bb = cannot taste bitter
15 possible enrichment points
Have each family member (immediate household family) taste the PTC paper.
Use their responses to identify their genotypes
Create a pedigree that shows the trait throughout your family
10 points extra if you include pictures of each family member while tasting the PTC paper.