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Name:
Date:
Genetics Review Sheet
Class:
Mr. Pistell
Genetics Vocabulary
Define and know the differences between these genetics vocabulary words:
1. Trait – a characteristic of someone (examples: eye color, hair color, height)
2. Heritable/inheritance/genetic – passing traits or genes
3. Allele – Different versions of a gene or trait
4. Gene – A section of chromosome (DNA) that codes for a trait
5. Chromosome – A string of DNA (gummy worm)– You have 46 total
chromosomes
6. DNA – Deoxyribonucleic acid – the code of life
7. Dominant – Always shows in genes
8. Recessive – Able to hide in genes
9. Genotype – 2-letter combination (Example: Aa)
10. Phenotype – Appearance or what shows
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Give an example of a trait and 2 alleles for that trait.
Eye color – Blue or Brown
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Give an example of a genotype (that goes with the trait and alleles above), and
the phenotype that goes with that genotype:
AA – Brown eyes
Aa – Brown eyes
aa – blue eyes
Punnett Squares
Punnett Square Skills:
 Tell me phenotypes of parents, if I give you their genotypes
 Fill out Punnett squares if I tell you the parent’s genotypes
 Tell me the genotype percentages of the children
 Tell me the phenotype percentages of the children
Name:
Date:
Class:
Mr. Pistell
Genetics Review Sheet
Punnet Square Problems - Finish the Punnett square and give the phenotype
percentages of the children! (no genotype percentages necessary!)
Genotypes – 2 TT, 2 Tt
Phenotypes – 100% tall
Genotypes –
all rr
Phenotypes – 100% white
Genotypes –
all BB
Phenotypes –
100% black
1. Straight hair (S) is dominant over curly hair (s).
Cross an Ss mother and an Ss father.
Genotypes – 1 SS, 2 Ss, 1 ss
Phenotypes – 75% straight, 25% curly
2. Free earlobes (F) are dominant over attached earlobes (f).
Cross an FF mother with an ff mother.
Genotypes – all Ff
Phenotypes – 100% Free earlobes
Pedigrees
Pedigree Skills:
Name:
Date:
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Genetics Review Sheet
Class:
Mr. Pistell
Tell me who is male and who is female
Show me an example of marriage
Show me what a parent/child relationship looks like
Tell me the phenotype of an individual on the chart (whether or not they have a
trait)
Be able to tell me how ANY 2 individuals on the pedigree are related!
Tell me the genotype of an individual on the pedigree (this can be difficult!)
1. Identify a male without the trait
2. Identify a female without the trait
3. How many individuals show the trait?
4. Is the trait recessive or dominant?
Why?
5. What is the relationship between I-2
and III-1?
6. What is the relationship between I-1
and II-3?
7. What is the relationship between II-2
and III-2?
8. What is the relationship between II-3 and II-4?
9. What is the genotype of III-1 – AA, Aa, or aa?
10. What is the genotype of II-3 – AA, Aa, or aa?