Transcript Genotype, Phenotype, Purebred Breeding, and Crossbreeding

 Define
genotype and phenotype and
know the differences with 100%
accuracy.
 Define purebred breeding and
crossbreeding and know the differences
with 100% accuracy.
 Identify examples of genotype and
phenotype in animals with 80% accuracy.
 Identify purebred and crossbred animals
with 80% accuracy.

Genotype: Genetic makeup of an animal.

Phenotype: The outward expression of a gene.

Purebred Breeding: The breeding of animals within the same
breed.

Crossbreeding: The breeding of two different pure breeds.

Codominance: a cross between organisms with two different
phenotypes produces offspring with a third phenotype in which
both of the parental traits appear together.

Incomplete dominance: a cross between organisms with two
different phenotypes produces offspring with a third phenotype
that is a blending of the parental traits.
 Why
should we know the difference
between genotype and phenotype?
 Why
should we know the difference
between purebred and crossbred
animals?
 Why
should we know how to identify
animals that are purebred or crossbred?
 What
is the difference between genotype
and phenotype?
 What
is the difference between purebred
and crossbred?
 What
are examples of animals that are
purebred and crossbred?
 Genotype: Genetic
makeup of an animal.
• Genotype is in the gene. It is something that we
cannot directly see.
 Phenotype: The
outward expression of a gene.
• Phenotype is the characteristic of the animal that
we can see. Ex, Holsteins are black and white.
• Purebred Breeding: The breeding of animals
within the same breed.
 Ex, Angus breeds with Angus not with Red Angus
• Crossbreeding: The breeding of two different
pure breeds.
 Ex, Angus can breed with Red Angus

What are examples of animals that are purebred and
crossbred?
• Animals are considered pure bred when they meet all the
characteristics of the breed.
• Owners of the animal will be able to track the lineage of
the animal to ensure heritage.
• Many ranches will have a purebred stud.
 This can bring in a lot of money due to other owners wanting
their females to breed with a purebred.
A
cross between organisms with two
different phenotypes produces offspring
with a third phenotype in which both of
the parental traits appear together.
 red x white ---> RED & WHITE
SPOTTED
R = allele for red flowers
W = allele for white flowers
red x white ---> red & white spotted
RR x WW ---> 100% RW
A
cross between organisms with two
different phenotypes produces offspring
with a third phenotype that is a blending
of the parental traits.
 RED
Flower x WHITE Flower ---> PINK Flower
R = allele for red flowers
W = allele for white flowers
red x white ---> pink
RR x WW ---> 100% RW
 Create
a new breed of animal.
 Crossbreed two breeds of animals to get
desired traits.
 Needs to show multiple characteristics and
have a punnett square for each one.
• EX). Body type, hair/fur color, body size, ect.
• Must use at least one codominant or incomplete
dominant trait.
 Draw
an example of your creation.
 Name your creation.
 Present to the class what you made and how.
 What
is the difference between genotype
and phenotype?
 What
is the difference between purebred
and crossbred?
 What
are examples of animals that are
purebred and crossbred?