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Genotype and
Phenotype
•Genotype - The actual
gene makeup of an
organism
• Genotype - The letters you’re
made up of
• Ex: - Hh or HH or hh
•It is made up of
two alleles, one
from each parent
• It’s got two letters,
one from Mom and
one from Pop
Homozygous (Purebred)
Both alleles are the
same
Both capital or both
lowercase letters
Example - GG or gg
• Heterozygous (Hybrid)
•Alleles are different
• One capital and one
lowercase
• Example - Gg
PhenotypeThe physical
characteristics of an
organism
It’s what you look like
Example - Tall, brown hair, …
•If there is one or more
dominant letter in the
Genotype, that is what
your phenotype will be
• If there’s a capital letter, then
you’ll look like what the
capital letter stands for
Example
If capital T stands for tall then
Genotype
TT
Tt
Tt
Phenotype
Tall
Tall
Short
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