|What is the difference between genotype and
A genotype is a portion of the DNA sequence in
an organism that is generally associated with a
specific trait. For instance if you have a
gene that codes for a protein, it may have two
different genotypes that produce different
results. The phenotype on the other hand is
what you actually see. An organism can have a
genotype that is associated with having red hair,
but their phenotype is having red hair. The reason
why it is an association is that the genotype
isn’t the only thing that determines the
phenotype. There is an additional layer of
information that decides the phenotype called the
epigenetics which roughly speaking
specifies where and when the genetic information
is read. There are also environmental influences
that can change the phenotype. So the phenotype is
the observable result of the genotype, the
epigenetics, and environmental influences.
A genotype is the combination of alleles in an
individual organism. The phenotype is the effect
that those alleles have when expressed,
whether the effect is a physical change, a
chemical change, a behavior, or all three.
So, for example, my eyes are blue; this is my
phenotype. I have two copies of the human blue-eye
allele. My cousin has one copy of the blue-eye
allele and one copy of the brown-eye allele;
that's her genotype. Her eyes are brown; that's
Genotype is the actual genetic makeup,
which for most animals means the set of genes,
where half are from the mother and half are from
the father. You can determine genotype from
genetic testing (for example taking blood and
testing the DNA).
The phenotype is the actual trait that you can
see directly in an animal, without having to do
genetic testing. This includes things like eye
color, body size, the shape of features like noses
and ears, etc. The phenotype is usually mostly
determined by the genotype, but environmental
factors may contribute to the phenotype. For
example, an animal may have a large-body genotype,
but if the animal is undernourished, this may
prevent them from growing as large as their
genotype allowed for. The resulting body size of
the animal is its phenotype.
Genotype refers to the unique DNA sequence of
an individual. Phenotype is the outward
characteristics that result from that genotype.
Click Here to return to the search form.
Copyright © 2015 The Regents of the University of California,
All Rights Reserved.