Predicting Traits with Punnett Squares
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Objective
I can predict the genotypes and phenotypes of offspring using Punnett squares.
Part 1 of 4
Warm-up video
Amoeba Sisters · 6:28Vetted channel
We don't generate video — this one is by Amoeba Sisters on YouTube. The practice questions and exit ticket below were drafted by AI for this objective, and every question is editable in the teacher guide.
Part 2 of 4
Key concepts
3 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.
Part 3 of 4
Practice
9 questions
Define the term 'allele' as it is used in genetics.
Explain the difference between a dominant and a recessive allele.
Part 4 of 4
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.”
Sample answer included in the free materials
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