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