1. Topic-
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2. Content-
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3. Goals: Aims/Outcomes-
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Students w/be able to (SWBAT):
1. Interpret Mendelian genetics.
2. Comprehend and carry out dihybrid crosses.
3. ID genotype and phenotype.
4. Define parental and filial generations.
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4. Objectives-
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1. Rediscover Mendel's law of ind. assortment.
2. Follow an entire plant growth cycle from seed to seed.
3. Recognize dominant and recessive phenotypes.
4. Observe and distinguish that heritable mutations may hide in one
generation and pop up in another. |
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5. Materials and Aids-
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Entire experiment:
--Potting mix (1 part Peatlite, RediEarth, or JiffyMix to 1 part medium
vermiculite)
--Miracle Gro fertilizer
--1L pop bottles
--2L pop bottles
--Planting flats
--Grow lights
--Masking Tape
--Felt tip pens
--Spoons
--Ruler
--Q-Tips
Phase 1
--F1 wild type seeds
Phase 2
--Color photos or grown versions of Fast Plant mutants
--Class data sheet
--1 envelope with 6 PA seeds
--1 envelope with 6 PB seeds
--1 envelope with 6 F1 seeds
--1 envelope with 6 double-mutant seeds
--1 envelope with 18 F2 seeds |
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6. Procedures/Methods-
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A. Introduction-
1. Plant F1 Fast Plant seeds.
2. Cross pollination.
3. Plant F2/mutant Fast Plant seed. |
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B. Development-
Phase 1
Day 1(on a Mon or Tues): Hand out the Phase 1 instructions, seed flats,
and F1 seeds. Oversee the planting of the seeds.
Days 2-4: Remind students to water their seed flats with their water
bottles.
Every day: Have students check the nutrient levels in their reservoirs
and add 1/8 X
Peter's as necessary to keep the level up near (but not above) the
bottom of the slotted tray.
It is a good idea to add the 1/8 X Peter s to the seed flats and allow
it to run through
the slots to the reservoir. Make
sure that all reservoirs are full at the end of the day before weekends
and holidays.
Days 4-7: Have students transplant some seedlings if necessary and/or
remove extra
seedlings, so as to end up with two healthy plants per film can.
Days 13-17: Have students cross-pollinate plants with open flowers
on at least three successive days.
Days 17-35: Remind students to observe seed pod development at intervals.
If time permits, you may want to dissect a few seeds at intervals,
so students can view the embryos developing inside the seeds with
a dissection microscope.
Day 35+(approximately 20 days after last pollination): Have students
remove their plants
from the water so that the seed pods can dry out.
Day 38-40+: After the seed pods are thoroughly dry, have students
harvest the seeds
according to instructions on the student pages. Supply small envelopes
for storing the
seeds. |
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C. Practice-
1. Recording data in lab notebooks.
2. Planting different generational seeds.
3. Recording class data. |
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D. Independent Practice-
1. Guided worksheets.
2. Lab notebook.
3. Lab report. |
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E. Accommodations (Differentiated Instruction)-
1. Scaffolding of notes.
2. Dual language notes and instructions.
3. Visual demonstrations.
4. Lab groups. |
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F. Checking for understanding-
1. Periodic review of lab notebooks.
2. Guided worksheets.
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G. Closure-
1. Analysis of class data
2. Lab report |
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7. Evaluation-
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1. Lab report
2. Lab notebook.
3. Lab presentations (?) |
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