Predicting Traits with Punnett Squares
Grade 12th Grade · Science · 45 min
What's Included
Learning Objective
I can predict the genotypes and phenotypes of offspring using Punnett squares.
Warm-Up Video
Amoeba Sisters · 6:28
Monohybrids and the Punnett Square Guinea Pigs
Guided Notes
3 key concepts
- 1
A recessive allele is represented by a lowercase letter and will only show up if there is no dominant allele present.
- 2
A guinea pig with hair can have a genotype of HH or Hh, while a hairless guinea pig's genotype is hh.
- 3
In a monohybrid cross of two heterozygous (Hh) guinea pigs, the predicted genotype ratio of the offspring is 1HH: 2 Hh: 1 hh, and the phenotype ratio is 3 have hair: 1 hairless.
Practice Questions
9 questions · Multiple choice & Short answer
Exit Ticket
Quick comprehension check
“Two guinea pigs are crossed. One is homozygous recessive (hh) for the hair trait, and the other is heterozygous (Hh). Use a Punnett square to predict the percentage of offspring that will be hairless. Show the Punnett square.”
Teacher Guide
Get the complete package:
- Answer keys for all questions
- Differentiation strategies
- Extension activities
- Printable student handouts
