Transcript Dihybrid cross lab - Aurora Public Schools: APS Home

Dihybrid cross lab
Problem: How do the predicted results compare
to the observed results of a dihybrid cross?
Background:
Monohybrid cross: Look at one trait in an
organism to predict offspring.
Example: Albinism in humans. Aa x aa
Dihybrid cross: look at 2 traits in an organism to
predict offspring.
Example: Albinism and dwarfism in humans.
AaMm x AaMm
Dwarf (dwarfism)- mm
(normal height is MM or Mm)
Albino (albinism) –aa
(normal color is Aa or AA)
Hypothesis: If we test how the predicted
results compare to observed results in a
dihybrid cross, then
Procedure: 1) Complete the punnett square for
the dihybrid cross with teacher. Then fill in
the chart.
2. Get 4 coins per group. Label 2 of the coins
with M on one side and m on the other.
3. Label the other 2 coins with A on one side
and a on the other.
4. One set of coins (A coin and M coin)
represent 1 parent, the other set represents
the other parent.
5. Flip the coins together 96 times, and record
the data.
Data: Fill in data table.
Data analysis: Explain what a dihybrid cross
shows.
Conclusion: Write a CER paragraph to explain
how the predicted results compared to the
observed results in this lab.