Genotype and Phenotype

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Slide 1

Genotype and Phenotype

What is the difference?

Slide 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

Slide 3

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

Slide 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

Slide 5

Phenotype

The outward appearance of the trait.

How an organism looks

How an organism acts

How an organism feels

Slide 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.