Predicting Traits with Punnett Squares
12th Grade · Science · 45 min
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Learning Objective
I can predict the genotypes and phenotypes of offspring using Punnett squares.
- 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.
