Lab 7 Punnett Squares
Complete your answers in the spaces provided. USE YOUR OWN WORDS – Yes even
for definitions! Remember to add your last name and first initial to the file name prior to
saving and submitting your completed assignment through Canvas.
Use your textbook, notes and this website to answer the pre lab questions.
1. Define the terms haploid and diploid.
2. What information do we gain from doing a punnett square?
3. Define the term allele.
4. How many copies of each trait are contained in a single gamete?
Click on the link below to access the online lab.
Download and print the instructions for reference as you work through the lab. As you
work through the lab fill in the table below. Use this information to answer the questions
that follow contained in this document.
Complete all ten scenarios and record your results in Table 1.
When you record a ratio, whether it is genotypic or phenotypic ratio, always record the
most dominant characteristic first, followed by the recessive.
1 GG, 2 Gg, and 1 gg
1 GG : 2 Gg : 1 gg
2 GG and 2 Gg
2 GG : 2 gg
* With monohybrid standard dominance traits there are only 2 possible phenotypes. The
dominant and the recessive. You always report the dominant phenotype first followed by
the recessive phenotype.
Post Lab Questions
5. If you mate two black flies what color(s) can their offspring be and why?
6. How can two flies with normal wings have offspring with vestigial wings?
7. Someone removed the labels from your fly jars. You have a jar of gray flies. Do you
know their genotype? Why or why not?
8. You mate two gray normal winged flies and get offspring which are all gray but 25%
of them have vestigial wings. What are the genotypes of the flies you mated? Explain
9. Explain how many phenotypes are there for a trait that has two alleles that are
governed by incomplete dominance.
10. Explain how many phenotypes are there for a trait that has two alleles that are
governed by co- dominance.
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