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Name: _____________________________
Punnett Squares and Probability
Know the textbook definition for the following vocabulary terms:
1. Trait
2. Genetics
3. Gene
4. Alleles
5. Dominant allele
6. Recessive allele
7. Phenotype
8. Genotype
9. Homozygous
10. Heterozygous
1. What is the difference between genotype and phenotype?
Give an example of each:
2. What does a Punnett Square tell you?
3. Label the following alleles as heterozygous, homozygous dominant, or homozygous recessive:
AA -
Tt -
aa -
TT -
Aa -
tt -
4. If B=brown and b=blue, write the phenotype for the following genotypes:
BB -
bb -
Bb -
5. Parent A, with the genotype Dd has dimples. Parent B, has the genotype DD and has dimples. .
Draw a Punnett Square and use it to find the probability of all genotypes and phenotypes of the offspring.
6. Parent A, with the genotype Bb has brown eyes. Parent B, has the genotype bb and has blue eyes.
Draw a Punnett Square and use it to find the probability of all genotypes and phenotypes of the offspring.
7. Parent A, is heterozygous and is tall. Parent B, has the same genotype and phenotype as parent A.
.
Draw a Punnett Square and use it to find the probability of all genotypes and phenotypes of the offspring.
8. Parent A, is with genotype GG has green eyes. Parent B, with genotype gg has grey eyes.
.
Draw a Punnett Square and use it to find the probability of all genotypes and phenotypes of the offspring.
9. A heterozygous white flowered pea plant is crossed with a homozygous pink flowered pea plant. What is the
probability that the offspring will have pink flowers?
10. A homozygous yellow pea plant is crossed with a homozygous green pea plant. What is the probability that
the offspring will be green if green is the dominant trait?