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Half (50%) of the seeds that sprouted were white, instead of the normal 25% expected from a recessive trait from heterozygous parents. Because of this, we can justify  our statement (explanation 2), because the seeds exhibited a change in phenotypic ratio, as our explanation predicted. However, we cannot fully determine a creditable justification because we had a very small sample size.

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Out of the 100 seeds with little light, there was 1 sprout of each color (one white, one green). However, none of the 100 seeds with regular light sprouted, or even grew roots, leaving us with a sample size too small to determine anything from.

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Little light - 1:1
Regular light - 0:0

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Add 1 mL to the dish with no paper over it

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Add 1 mL of water to each dish

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Add 1 mL of water to each dish

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The seed that were under the paper have sprouted
Add 1 mL of water to each dish

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Add 1 mL of water to each dish

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Add 1mL of water to each dish

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2 mL water
1 Beaker
2 Petri dishes
200 Tobacco seeds
1 Fluorescent light
1 White construction paper
2 Filter papers

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2 petri dishes
1 Beaker
6 mL of water
200 tobacco seeds
2 Filter papers
1 White construction paper

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1. place one filter paper in each petri dish
2. measure 1mL of water in the beaker
3. pour 1mL of water in each petri dish
4. separate the seeds into 2 piles of 100 seeds
5. pour 100 seeds  into each petri dish
6. place both under a light source
7. place white construction paper over one dish
8. record results throughout the week

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CONTROL:
water amount
seed number
petri dish set up
temperature
genotype

INDEPENDENT:
light intensity

DEPENDENT:
phenotype

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1. No horseplay
2. Don't eat seeds or drink water
3. Handle glassware with care.
4. Report glass breaks and spills to teacher/instructor
5. Wear goggles and lab apron

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Genotype Ratio: 1:2:1
Phenotype Ratio 3:1

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Can the environment influence the genotype or phenotype of an organism such as the tobacco plant?