L 3 corn lab
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#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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Background

Plants use the pigments (mainly chlorophyll) in chloroplasts to make glucose. This is called photosynthesis. It occurs as follows:

6H2O + 6CO2→ C6H12O6 + 6O2

Background


Background1

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


Background2

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


Background3

Plants that inherit these recessive alleles will die, because they cannot make food.

Background


Problem

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


1 purpose

To determine the unknown genotypes of corn plants by observing the offspring phenotypes.

(Copy this slide into your lab report)

1. Purpose


2 hypothesis

If the parent(s) carry the recessive, albino, allele, then about ¼ or ____ % of the offspring will show the albino phenotype.

Ggx Gg

(Copy this slide into Lab

Report- fill in Punnett

square & list expected

GR & PR)

2. Hypothesis


3 materials

List all of the materials required for this experiment. about ¼

(List the materials in your lab report).

See your rough draft that I passed back.

3. Materials


4 procedure

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


5 results

Copy this table and show in your lab report. about ¼

Albino vs. Green Corn. Class Results

5. Results


5 results cont d

(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 # plants

5. Results (cont’d)


6 conclusion

(Report whether or not you accept your hypothesis and state why).

Ex. The corn plants must/must not carry the albino alleles because……………….

6. conclusion



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