worksheet
AP Biology: Unit 3: Cell Division & Genetics: Virtual Lab #4: Punnett Squares
Instructions
1. Open the Virtual Lab: Punnett Squares: http://www.mhhe.com/biosci/genbio/virtual_labs_2K8/labs/BL_05/index.html
2. The virtual lab simulation will be on the right side of the screen, and the “Question” column will be on the left side of the screen.
3. Click on the TV/VCR and watch the video.
4. Read the background information in the Question Column under “How can Punnett Squares help predict the traits of offspring?”
5. Read the background information provided in the virtual lab by clicking on the “Information” bar in the lab simulation area.
6. Answer the questions below in your notebook.
a. Which of the following is most inclusive?
i. Allele ii. Genotype
b. Dominant alleles are represented by:
i. an upper case letter ii. a lower case letter iii. it does not matter what type of letter is used
c. In fruit flies, gray body color is dominant over black body color. Using the letter G to represent body color, what is the genotype of a heterozygous gray bodied fly?
i. GG ii. gg iii. Gg iv. GGgg
d. All of the offspring of two gray bodied flys are also gray. What can you conclude about the genotypes of the parent flies?
i. They are both heterozygous. ii. They are both homozygous dominant. iii. They are both homozygous recessive. iv. You cannot conclude anything definitively about the parental genotypes.
e. Some of the offspring of two gray bodied flies are black. What can you conclude about the genotypes of the parent flies?
i. They are both heterozygous. ii. They are both homozygous dominant. iii. They are both homozygous recessive. iv. You cannot conclude anything definitively about the parental genotypes.
7. Follow the instructions in the “Question” column to complete the Punnett Square simulations. Record your results for all 10 scenarios in Table 1 in your notebook. To change the scenario number, hit the reset button at the
Instructions
1. Open the Virtual Lab: Punnett Squares: http://www.mhhe.com/biosci/genbio/virtual_labs_2K8/labs/BL_05/index.html
2. The virtual lab simulation will be on the right side of the screen, and the “Question” column will be on the left side of the screen.
3. Click on the TV/VCR and watch the video.
4. Read the background information in the Question Column under “How can Punnett Squares help predict the traits of offspring?”
5. Read the background information provided in the virtual lab by clicking on the “Information” bar in the lab simulation area.
6. Answer the questions below in your notebook.
a. Which of the following is most inclusive?
i. Allele ii. Genotype
b. Dominant alleles are represented by:
i. an upper case letter ii. a lower case letter iii. it does not matter what type of letter is used
c. In fruit flies, gray body color is dominant over black body color. Using the letter G to represent body color, what is the genotype of a heterozygous gray bodied fly?
i. GG ii. gg iii. Gg iv. GGgg
d. All of the offspring of two gray bodied flys are also gray. What can you conclude about the genotypes of the parent flies?
i. They are both heterozygous. ii. They are both homozygous dominant. iii. They are both homozygous recessive. iv. You cannot conclude anything definitively about the parental genotypes.
e. Some of the offspring of two gray bodied flies are black. What can you conclude about the genotypes of the parent flies?
i. They are both heterozygous. ii. They are both homozygous dominant. iii. They are both homozygous recessive. iv. You cannot conclude anything definitively about the parental genotypes.
7. Follow the instructions in the “Question” column to complete the Punnett Square simulations. Record your results for all 10 scenarios in Table 1 in your notebook. To change the scenario number, hit the reset button at the