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Genotype and Phenotype
What is the difference?
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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
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GenotypeHow 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
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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
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Phenotype
The outward appearance of the trait.
How an organism looksHow an organism actsHow an organism feels
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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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