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REEBOP LAB
Reebops are a multicellular, sexually reproducing species. The body cells of a reebop contain 14 total (or 7 pairs
of) chromosomes. Six of the seven pairs of chromosomes are autosomes, which contain the genetic information for
both male and female reebops. The seventh pair of chromosomes is the sex chromosomes. Identical to humans,
reebop sex chromosomes are identified as X and Y with the chromosomal pair XX determining the females and the
chromosomal pair XY determining the males.
Purpose: To simulate the process of meiosis and fertilization and to apply the laws of genetics to the phenotypic
expression of reebop characteristics.
Materials: You will supply your materials for this lab. The only stipulation is that all materials used to make your
Reebop parents and 2 Reebop babies must be recyclable materials.
Procedure:
Step One – Determine Traits, Alleles, Genotypes and Phenotypes.
The table below describes the traits you will show in your Reebop family:
1
Body Size
Dominant Allele
and Phenotype
B – Large body
2
Body Color
P – purple
p - yellow
3
Eye Size
E – large eyes
e – small eyes
Horns
h – horns absent
Arm number
H – horns
present
A – 2 arms
Warts
N – no warts
n – warts
present
Trait #
Description of Trait
4
5
6
Recessive Allele
and Phenotype
b – small body
a – 4 arms
Data & Observations:
Data Table 1: Parent Reebops – Both parents are heterozygous, so please fill in the chart for their genotype and
phenotype (yes, this is really easy)
Trait #
1) Body Size
2) Body Color
3) Eye Size
4) Horns
5) Arm Number
6) Warts
7) Gender (sex chromosome pair)
Mom Reebop
Genotype
Phenotype
Dad Reebop
Genotype
Phenotype
Data Table 2: Baby Reebops – For each of the baby Reebops, please toss two coins. Heads indicates receipt of a
dominant allele, tails indicates receipt of a recessive allele. (For the sex chromosomes, heads will indicate X, tails
will indicate Y). You will need to flip 7 times for each Reebop baby.
Trait #
Reebop Baby #1
Genotype
Phenotype
Reebop Baby #2
Genotype
Phenotype
1) Body Size
2) Body Color
3) Eye Size
4) Horns
5) Arm Number
6) Warts
7) Gender (sex chromosome pair)
Step Two – Construction of Reebop Family
Use the materials your teacher provides to construct the Reebop family – both parents and both babies…be sure to
reference back to your phenotypic chart.
Analysis Questions:
1. Reebop cells have a diploid number of 14. How many chromosomes are in reebop gametes?
2. Is it possible for two organisms to have different genotypes but the same phenotype? Explain.
3. Is it possible for two organisms to have different phenotypes but the same genotype? Explain.
4. Determine the overall probability or chance of parents heterozygous for all of the traits listed in the chart
below of having a baby reebop with the following traits: A one-eyed female with three body segments, four
legs, red antenna and back humps, brown nose, and a fat curly tail.
Reebop Traits for this question:
Trait
Number of Body Segments
Color of Antennae
Color of Back Humps
Color of Nose
Size of Tail
Shape of Tail
Number of Eyes
Number of Legs
Dominant
B–2
R – red
P – red
N - red
F – fat
H - straight
E-2
L-4
Recessive
b-3
r - silver
p - silver
n - brown
f - thin
h - curled
e-1
l-1