Name: _____________________
Start Date: ________________
Genetics
Activity Title: 65: Breeding Critters- More Traits
(we skipped activity 64)
Key Vocabulary:
allele
characteristic
chromosome
trait
dominant
gene
recessive
*incomplete dominance
*co-dominance
*diversity
Staple any handouts or papers related to this activity to this sheet.
Questions/Headings/
Problems:
Notes:
Diversity
*Differences
*The diversity among sexually reproduced organisms
results primarily from the many possible combinations of
pairs of alleles transferred from parents to offspring.
*Not all traits are dominant/recessive as in Mendel’s pea
plants and our critter’s tail color.
Incomplete dominance
*Gives an in-between or intermediate appearance. Traits
blend together.
*Example from lab: Nose length
*Example: Red flowers are bred with white flowers to
produce pink flowers.
Co-dominance
*Both traits are dominant and fully present.
*Example from lab: critter had both blue and green
spikes.
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*Example: Red flowers are bred with white flowers to
produce red and white striped flowers.
Heredity and
Environment
*Both heredity and the environment play roles in
determining the traits of an organism. (lifestyle also)
*Example: skin color is initially inherited, but is influenced
by sun exposure.
Critical Response
How would you explain incomplete dominance and co-dominance to a friend?
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Critter Breeding Worksheet
*read directions carefully especially for traits 4, 6 and 8
Trait
Ocean’s
Alleles
Heads Tails
Offspring’s Genes
From
Ocean
From Lucy
Offspring’s
Trait
(Use critter
code to fill
this in)
Lucy’s Alleles
Heads
Tails
1. Body
Segments
2. Legs
B
b
B
b
L
l
L
l
3. Eyes
E
e
E
e
*4. Nose
N
n
N
n
5. Tail
Color
T
t
T
t
*6. Tail
Style
S
s
S
s
7.
Antennas
A
a
A
a
*8. Spikes
G
H
G
H
(see pg.D61)
9. Sex
Ocean’s Sex
Chromosomes
Heads Tails
X
Y
Offspring’s Sex
Chromosomes
From
From Lucy
Ocean
Offspring’s
Sex
Lucy’s Sex
Chromosomes
Heads
Tails
X
X
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Picture of Critter (colored)
Have one person from your group draw the critter on the board
4
Analysis Questions
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