Principles of Biomedical Technology (Principles of Biomedical Science)Pedigree symbols showing shaded affected people and open unaffected people Pedigree symbols showing shaded affected people and open unaffected people
Unit 2: Unit 2.2 to 2.3 Genetic RiskPBS 2.2-2.3Biotechnology Research and Experiments
Read A Pedigree
Use a genetics model to read a pedigree with clear limits.
Builds on (2 levels back)inferred · high confidence
- DNA/RNA base pairing: Sequence and codon tasks depend on reading bases in order.
- Read a genetics model: Pedigrees, karyotypes, and charts are models that need a key.
Prerequisites are inferred: pending teacher review.
Re-learn the skill with worked practice and clear examples.
Use a genetics model to read a pedigree with clear limits.
Step 1: Learn the key
Read the genetic [blank] first, compare it to the key or chart, and separate risk from a confirmed [blank].
Step 2: Use the model
Read the figure, table, control, range, or protocol before choosing an answer.
Step 3: Name the limit
Say what the evidence can support and what it cannot prove yet.
Practice
Use the genetics figure/table. Which interpretation is most careful?
Reviewed- A.Use the key/chart result and state only what it supports
- B.Ignore the key and guess
- C.Call every variant a disease
- D.Delete uncertain results
Show the worked solution ▾
Answer: A. Use the key/chart result and state only what it supports
- Step 1: Use the model: The figure/table provides the needed key.
- Step 2: Avoid overclaiming: Genetic evidence often shows risk or pattern, not certainty alone.
Why it's right: The careful answer uses the model and respects limits.
Why the others miss:
- B: Guessing ignores the model.
- C: Not every variant causes disease.
- D: Uncertain results should be explained, not deleted.
Aligned to Biotechnology Research and Experiments · reading level ~grade 9
Where you'd see this
- In Unit 2.2 to 2.3 Genetic Risk, this skill turns class evidence into a result another person can check.
Video library
Watch: Read A Pedigree
Pedigrees
Amoeba Sisters · 8 min
Guided notes
Fill these in as you work through the lesson.
Big idea: Use a genetics model to read a pedigree with clear limits.
Key terms: write the meaning
- Allele (version of a gene):
- Genotype (allele combination):
- Phenotype (observable trait):
- Carrier (has allele but may not show trait):
The rule
Read the genetic first, compare it to the key or chart, and separate risk from a confirmed .
Check yourself
- What does the model key say?
- What pattern or DNA change is shown?
- Does this show risk, carrier status, or diagnosis?
Work one example
Use the provided model to practice read a pedigree and write one cautious interpretation.