JUNGLE IGUANA ( Green ) well adapted to heavy tropical forest

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Transcript JUNGLE IGUANA ( Green ) well adapted to heavy tropical forest

Iguanas original environment
• Green Iguanas are forest dwelling lizards that live
high in the tree canopy of the South American
• Young iguanas stay in areas lower in the forest
canopy. Mature iguanas live higher in the tree tops.
Iguanas rarely leave the trees. The only real
exception to this is when the female iguanas must
come down from their sky high home in order to dig
burrows in which the female iguanas lay their eggs.
• Iguanas prefer to have water around them as
iguanas are excellent swimmers and will often
dive beneath the water to avoid oncoming
JUNGLE IGUANA ( Green ) well
adapted to heavy tropical forest
In the Jungle…Nature selects Climbing
feet. Not webbed
Jaguars prey on iguanas
Nature selects the fear instinct. Instinct is
to Seek safety in trees when frightened
Good Camoflage
Tsunami enters jungle environment
Tsunami floods jungle lowlands could
wash groups of iguanas out to sea
Many trees wash out to sea… some
perhaps with iguanas in the branches
MUTATIONS… all are super-dominant
• 1. no mutation
• 2. “N” Nostril genes mutate during meiosis. The
new gene causes glands in the nose to collect
extra salt from the blood and to expel that salt.
• 3. “B” mutation of skin pigment gene causes
black pigment instead of green
• 4. “S” Mutation of foot shape gene on
chromosome 2 causes webbed feet
• 5. “C” The “calm gene” is a Mutation of the fear
reaction gene on chromosome 3. The calm gene
causes fear reaction to dissapear.
The new environment. Which traits
will be selected here ?
Galapagos islands
That was a long trip !
Stranded !! Algae is your food now !
IF you missed it
• The iguana tsunami activity is designed to get
your thinking about how a population of
iguanas might change over time if they are
“dropped” into a new environment.
• 1. Your Conclusion: Based on your
observations…what causes long and short
wings in fruit Flies? ( worth 0 points )
• 2. Give all evidence you can to support your
• 3. Explain how you used “IF THEN “
predictions to disprove 3 other hypotheses