Trait Tracker Reference Chart
Trait Tracker
Heredity vs. Environment: A Student Sorting Reference
Grades 5 & 8
The Great Divide
Inherited Traits
Passed from parents to offspring through DNA.
- • Eye/Hair Color
- • Leaf Shape
- • Dimples
- • Instinctive Behaviors
Learned/Acquired
Gained through practice or environment.
- • Riding a Bike
- • Reading/Writing
- • Scars or Bruises
- • Language/Accent
Trait Classification
Ask these 2 questions to classify a trait:
1
Was it there at birth? If yes, it's likely Inherited.
2
Did you have to practice? If yes, it's Learned/Environmental.
Myth Busters
❌ Myth: Animals "decide" to adapt.
✅ Fact: Adaptation happens over many generations through natural selection.
❌ Myth: Acquired traits pass to offspring.
✅ Fact: A parent's broken wing or scar does NOT change their baby's DNA.
Grade 8 Focus
The Gene Grid
A Punnett Square predicts the probability of an offspring inheriting a specific trait.
B
b
B
BB
Bb
b
Bb
bb
B: Dominant Allele (Brown)
b: Recessive Allele (Blue)
Phenotype: Physical trait you SEE (e.g., Brown Eyes).
Genotype: The allele combination (e.g., Bb).
Change Over Time
Adaptation
A specific inherited trait that improves an organism's chance to survive in its environment.
Example: A polar bear's thick fat and white fur.
Evolution
The process where beneficial adaptations become common in a population over many generations.
Scale: Happens to POPULATIONS, not individuals.
"Your DNA is the blueprint, but your journey builds the house."
Nature Nurture
