FRUITFLY GRAPHS
F1 Generation Data
This table consists of the number of the different phenotypes present in the F1 generation or the generation produced by the parental or P generation. Specifically, this shows that the parental generation had to be true breeding for traits of wing shape and eye color. One would have to be homozygous recessive for both traits and the other had to be homozygous dominant for both traits. The results below show evidence of this.
Table 1.1
| Phenotype | Females | Males |
| Red Eyed/Long Winged | 54 | 31 |
| Brown Eyed/Long Winged | 0 | 0 |
| Red Eyed/Vestigial Winged | 0 | 0 |
| Brown Eyed/Vestigial Winged | 0 | 0 |
F2 Generation Data
This table shows the results of crossing the flies from the Fl generation with each other. The Fl�s genotype had to be RrLl so their offspring would be one of any of the combinations of eye color and wing traits that are possible due to the combination. The phenotypes are varied in a ratio similar to the results found in a Punnett Square of the cross.
Table 1.2
| Phenotype | Females | Males |
| Red Eyed/Long Winged | 42 | 43 |
| Brown Eyed/Long Winged | 18 | 18 |
| Red Eyed/Vestigial Winged | 9 | 10 |
| Brown Eyed/Vestigial Winged | 3 | 2 |
Generation Ratios
This chart shows the ratios of the expected genotypes and phenotypes both in the F1 generation and in the F2 generation. As you can see the Fl generation only has one outcome due to the fact that the parental generation consisted of a two trait, homozygous dominant fly mating with a two trait, homozygous recessive fly. The F2 generation is more varied and has at least one of each genotype and phenotype possible due to the combination.
Table 1.3
| Expected Genotypic Ratio | Expected Phenotypic Ratio | |
| F1 | 16:0 | 16:0 |
| F2 | 4:2:2:2:2:1:1:1:1 | 9:3:3:1 |
Chi-Squared Analysis
This chart shows the calculations and numbers needed to decide whether or not the data collected was by chance. Using the calculation of the chi-square analysis way of finding this, the observed and expected values are used. This shows our findings were conclusive.
Table 1.4
| Phenotype | # Observed (o) | # Expected (e) | (o-e) | (o-e)^2 | [(o-e)^2]/e |
| Red Eyed/Long Winged | 85 | 82.1 | 2.1 | 4.4 | 0.05 |
| Brown Eyed/Long Winged | 36 | 27.4 | 8.6 | 74 | 2.70 |
| Red Eyed/Vestigial Winged | 19 | 27.4 | -8.4 | 70.6 | 2.58 |
| Brown Eyed/Vestigial Winged | 5 | 9.1 | -4.1 | 16.8 | 1.85 |
| X^2 = | 7.18 |
Parental Cross RRLL/rrll
( R = red eyes r = brown eyes L = long wings l = vestigial wings )
This is a Punnett Square showing the possible outcome of the cross between the parent generation�s genotypes. Showing the proposed and mathematically correct out comes of a cross between two homozygous dominant traits and two homozygous recessive traits, is what this Punnett Square portrays. As you can see there is only one genotypic combination that could be an outcome from this cross.
Table 1.5
| rl | rl | rl | rl | |
| RL | RrLl | RrLl | RrLl | RrLl |
| RL | RrLl | RrLl | RrLl | RrLl |
| RL | RrLl | RrLl | RrLl | RrLl |
| RL | RrLl | RrLl | RrLl | RrLl |
Fl Cross RrLl/RrLl
( R = red eyes r = brown eyes L = long wings l = vestigial wings )
This is a Punnett Square showing the possible outcome of the cross between the F1 generation�s genotypes. Showing the proposed and mathematically correct out comes of a cross between two pairs of heterozygous traits, is what this Punnett Square portrays. As you can see there are many genotypic combinations that can be an outcome from this cross.
Table 1.6
| RL | Rl | rl | rL | |
| RL | RRLL | RRLl | RrLl | RrLL |
| Rl | RRLl | RRll | Rrll | RrLl |
| rl | RrLl | Rrll | rrll | rrLl |
| rL | RrLL | RrLl | rrLl | rrLL |
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