#L-3 Corn Lab. Plants use the pigments (mainly chlorophyll) in chloroplasts to make glucose. This is called photosynthesis. It occurs as follows: ↓ 6H 2 O + 6CO 2 → C 6 H 12 O 6 + 6O 2. Background.
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Plants use the pigments (mainly chlorophyll) in chloroplasts to make glucose. This is called photosynthesis. It occurs as follows:
6H2O + 6CO2→ C6H12O6 + 6O2Background
In corn, the allele for making chlorophyll is dominant (G). A recessive allele (g) codes for no pigment. If a plant inherits two recessive alleles it will not produce chlorophyll and will be albino.
GG or Gg = green (has chlorophyll)
Gg= albino (no chlorophyll)Background
While many organisms can inherit the albino genes: A recessive allele (g) codes for no pigment. If a plant inherits two recessive alleles it will not produce chlorophyll and will be albino.Background
Plants that inherit these recessive alleles will die, because they cannot make food.Background
You want to plant some corn as a crop for food, but are concerned that your seeds (parents) carry the recessive allele for albinism. You don’t want to waste your time if much of your corn will die.
In order to determine if the parents have the lethal allele, you will plant some of the seeds and observe if any of the offspring are albino.Problem
To determine the unknown genotypes of corn plants by observing the offspring phenotypes.
(Copy this slide into your lab report)1. Purpose
If the parent(s) carry the recessive, albino, allele, then about ¼ or ____ % of the offspring will show the albino phenotype.
(Copy this slide into Lab
Report- fill in Punnett
square & list expected
GR & PR)2. Hypothesis
(List the materials in your lab report).
See your rough draft that I passed back.3. Materials
List about ¼ the procedure for this experiment.
(List the procedure in your lab report).
See your rough draft that I passed back.4. Procedure
Albino vs. Green Corn. Class Results5. Results
(Calculate the percent green and percent albino corn and report in results section.)
Percent green = # green plants x 100
total # plants
Percent albino = # albino plants x 100
total # plants5. Results (cont’d)
Ex. The corn plants must/must not carry the albino alleles because……………….6. conclusion