Zork genetics

1. Cross a heterozygous green skinned zork
with a yellow skinned zork.
R r
r
r
Rr rr
Rr rr
What are the phenotypes of the possible offspring?
50% Green skinned
50% yellow skinned

2. A long time ago, in a galaxy far, far away, a
great race of beings lived on a planet called
ZORK. The inhabitants were known as
Zorkonians. They are made up of 10 basic
genes that code for their appearance. Each
one of these genes is made up of 2 alleles.
With this in mind, there are 1,024 different
possible combinations for their appearance!
This is called their PHENOTYPE or their
physical appearance. If we look at their
genes, there are 59,040 different
combinations of the alleles. This is called the
GENOTYPE or genetic makeup. Remember
that we use letters for the alleles that control
the genes and one letter, or allele, is inherited
from each parent. You will be using Zorks to
see how genes are passed on and inherited.
You will be using Punnett Squares to do this.

3. Cross a homozygous two horned zork
with a heterozygous two horned zork.
H H
H
h
HH HH
Hh Hh
What are the genotypes of the possible offspring?
50% HH
50% Hh

4. Cross a heterozygous green haired zork with
a heterozygous green haired zork.
G g
G
g
GG Gg
Gg gg
What are the genotypes and phenotypes of the
possible offspring?
25% GG (green hair)50% Gg (green hair)
25% gg (yellow hair)

5. Cross a green lipped zork with a
heterozygous purple lipped zork
l l
L
l
Ll Ll
ll ll
What are the genotypes and phenotypes of the
possible offspring?
50% Ll (purple lip)50% ll (green lip)

6. Tork, who is homozygous for tall
meets Vorkina, who is short.
T T
t
t
Tt Tt
Tt Tt
What are the genotypes and phenotypes of the
possible offspring?
100% Tt (tall)

7. Tork and Vorkina have two children. One is a boy named Torky and the
other is a girl named Vorki. Many years later, Torky meets and marries a
girl named Morkalina, who is short.
T t
t
t
Tt tt
Tt tt
What are the genotypes and phenotypes of the
possible offspring?
50% Tt (tall) 50% tt (short)

8. Vorki, the daughter, meets a Zork named Spork, who
is heterozygous for the tall trait.
T t
T
t
TT Tt
Tt tt
What are the genotypes and phenotypes of the
possible offspring?
25 % TT (tall) 50% Tt (tall)
25 % tt (short)

9. Torky has green hair and Morkalina has yellow hair. They
have 4 children and all of them have green hair.
g g
?
?
Gg Gg
Gg Gg
What phenotype and genotype must Torky be?
Green hair, GG

10. Spork and Vorki both have 3 eyes
e e
e
e
ee ee
ee ee
What are the genotypes and phenotypes of
the possible offspring?
100% ee (3 eyes)