Genotype and Phenotype
What is the difference?
Review Words

Characteristics – are the category of a trait –


Traits – the physical, social, and emotional qualities of an
organism


Example – most pea plants show as tall
Recessive Trait – when a minority of an organism shows the
trait.


Example – blue eyes, tall, hates carrots
Dominant Trait – when a majority of an organism shows the
trait.


Example – eye color, height, likes/dislikes
Example – few pea plants show as short
Alleles – all the possible choices for a characteristic

Example – eye color – blue, brown, gray, green
Genotype
 How
the genes code for a specific trait.
 If the trait is dominant it uses a capital
letter

Example – Tall (T)
 If
the trait is recessive it uses the same
letter but lower case

Example – short (t)
 Genotypes
always have two letters – one
for dad and one for mom
Types of genotype

Purebred (homozygous) dominant – the genes
only have the dominant trait in its code.


Purebred (homozygous) recessive – the genes
only have the recessive trait in its code.


Example – Dominant Tall -- TT
Example – Recessive short – tt
Hybrid (heterozygous) – the genes are mixed
code for that trait.

Example – hybrid Tall -- Tt
Phenotype
 The
outward appearance of the
trait.
 How an organism looks
 How an organism acts
 How an organism feels
Tricks to remembering the difference
between Genotype and Phenotype
Genotype
– deals with
GENE CODE.
Phenotype – deals with
looks you can take a
PHOTO with.
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