Larkey
Genetics
What happens in a Larkey
population?
From Genotype to Phenotype!
 Decode
the genotype to produce the
Larkey’s phenotype!
Larkey Parents
Female Parent
Genotype
A
A
E
E
f
f
t
t
Male Parent
Genotype
a
a
e
e
F
F
T
T
Record their genotypes and draw the
phenotypes on the “Larkey Breeding Record.”
Larkey Genetics
 The
parent Larkeys will produce a male
and female Larkey.
 Record
their genotypes and draw the
phenotypes on the “Larkey Breeding
Record.”
F1 Generation Results
 Genotypes
= Aa, Ee, Ff, and Tt
 Phenotypes = short legs, red eyes, solid
fur, bushy tails
 All
offspring will have the same
genotypes, and therefore, the same
phenotypes. Why?
Types of Alleles
 homozygous
alleles = both parents started
with genotypes that had identical alleles,
so there is little diversity; homozygous
may be two dominant or two recessive
alleles; AA, aa, EE, ee, etc.
 heterozygous alleles = genes with one
dominant allele and one recessive allele;
Aa, Ee, etc.
Punnett Squares
 This
is a simple graphical way of
discovering all of the potential
combinations of genotypes that can
occur in children, given the genotypes of
their parents.
 It also shows us the odds of each of the
offspring genotypes occurring.
Immigrant Male
 Now,
an immigrant male produces a son
and a daughter with the female.
 This will increase diversity!
F2 Generation Genotypes
Female
Genotype
A
a
E
e
F
f
T
t
Immigrant Male
Genotype
A
A
E
E
F
f
t
t
F2 Generation Results-Male
 Genotypes
= Aa, EE, FF, and Tt
 Phenotypes =
 As more Larkeys are introduced, the
genetic diversity will increase! This
creates a healthy population.
 Record their genotypes and draw the
phenotypes on the “Larkey Breeding
Record.”
F2 Generation Results-Female




Genotypes = AA, EE, ff, and tt
Phenotypes = short legs, red eyes, spotted fur,
bare tail
As more Larkeys are introduced, the genetic
diversity will increase! This creates a healthy
population.
Record their genotypes and draw the
phenotypes on the “Larkey Breeding Record.”
Reading Assignment!
 With
another person at your table group,
you will FINISH THIS ASSIGNMENT:

Partner read pages 46 through 55.
Under each green heading, you will write
down 2-3 things you learned in your
Science Notebook!

Finished Early? Come see me! 
