LAB: Fruit Fly Single Cross Trait (Part 2)

Fruit Fly

Lab

Part 2

• RR is normal wing length

  Rr is normal wing length

  rr is vestigial wing length

• Normal wing length is the dominant trait. Vestigial wing length is the recessive trait.

What we can infer about the genotypes and phenotypes of the parents.

Multiple Choice

View the Parents in the video

Find Fly F under Parent #2.

Identify the phenotype for Fly F.

• Fly F has normal wings.

• Fly F has vestigial wings.

Collecting Data!

Watch video #2 on the next slide of a cross between Fly C with Fly F.

Make sure to Record the number of offspring from this cross that displayed Normal Wings and the number of flies that displayed Vestigial wings.

Draw

Fill in the data table

Open Ended

Describe the evidence that you collected in the data table, and how it will allow you to determine the genotype and phenotype of Fly C.

Hint: Remember you already know Fly F.

Multiple Choice

Which of the following would be the correct genotype for Fly C?

• RR

• Rr

• rr

Multiple Choice

Which of the following is the correct phenotype for Fly C?

• Fly C has Normal wings

• Fly C has Vestigial wings

Collecting Data!

Watch video #3 on the next slide of a cross between Fly A with Fly F.

Make sure to Record the number of offspring from this cross that displayed Normal Wings and the number of flies that displayed Vestigial wings.

Draw

Fill in the data table

Open Ended

Describe the evidence that you collected in the data table, and how it will allow you to determine the genotype and phenotype of Fly A.

Hint: Remember you already know Fly F.

Multiple Choice

Which of the following is the correct genotype for Fly A?

• RR

• Rr

• rr

Multiple Choice

Which of the following is the correct phenotype for Fly A?

• Fly A has Normal wings

• Fly A has Vestigial wings

Collecting Data!

Watch video #4 on the next slide of a cross between Fly B with Fly F.

Make sure to Record the number of offspring from this cross that displayed Normal Wings and the number of flies that displayed Vestigial wings.

Draw

Fill in the data table

Open Ended

Describe the evidence that you collected in the data table, and how it will allow you to determine the genotype and phenotype of Fly B.

Hint: Remember you already know Fly F.

Multiple Choice

Which of the following is the correct phenotype for Fly B?

• Fly B has Normal wings

• Fly B has Vestigial wing

Multiple Choice

Which of the following is the correct genotype for Fly B?

• RR

• Rr

• rr

At this point you should already know the phenotypes and genotypes of Flies A, B, C, and F.

Fruit Fly D and Fruit Fly E both have a dominant phenotype. They both have normal wings.

We can not determine their genotype just by looking at them.

We can, however, conduct crosses and observe their offspring as a means to infer their genotype.

Open Ended

Describe a cross of parent flies in the interactive above that you can use to determine the genotype of Fruit Fly E.

Explain how that cross will allow you to determine Fruit Fly E's genotype.

Hint: Think about what we did to determine both genotype and phenotype for Flies A, B, and C.