Name
Name ___________________________________________
Class ___________ Date ___________________
Punnett Squares:
Virtual Fly Lab
Go to the following website to complete the activity:
Purpose: To explore how Punnett squares are used to predict the outcomes of genetic crosses in flies.
Directions: For each scenario, follow the directions to complete the Punnett square. When you have solved each Punnett square, fill in the required information for each one.
After you are done with each scenario, click “Reset”.
*Note, the scenarios are not given in the correct order (I don’t know why they’re not!).
| |Probability of offspring being black |Probability of offspring being gray |
|Scenario 1 | | |
| |Probability of offspring being black |Probability of offspring being gray |
|Scenario 2 | | |
| |Probability of offspring having long wings |Probability of offspring having vestigial* |
| | |wings |
|Scenario 3 | | |
| |Probability of offspring having long wings |Probability of offspring having vestigial |
| | |wings |
|Scenario 4 | | |
| |Probability of offspring having|Probability of offspring having|Probability of offspring having|
| |LL genotype |Ll genotype |ll genotype |
|Scenario 5 | | | |
| |What are the two genotypes that you would need to produce 50% homozygous gray flies and 50% heterozygous gray flies? |
|Scenario 6 | | |
| |What are the two genotypes that you would need to produce 50% heterozygous long-winged flies and 50% vestigial-winged flies? |
|Scenario 7 | | |
| |What are the two genotypes that you would need to produce |
| |all heterozygous gray flies? |
|Scenario 8 | | |
| |What are the two phenotypes that you would need to produce |
| |all vestigial-winged flies? |
|Scenario 9 | | |
| |What are the two phenotypes that you would need to produce |
| |all black flies? |
|Scenario 10 | | |
My score = _________
20
-----------------------
*vestigial means that the part has no function any more
(vestigial wings
are small)
................
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