
LAB: Fruit Fly Single Cross Trait (Part 1)
Presentation
•
Biology
•
9th - 12th Grade
•
Practice Problem
•
Medium
Standards-aligned
Kas Qualls
Used 10+ times
FREE Resource
5 Slides • 22 Questions
1
Students will use descriptions of individual genotypes and phenotypes to construct a key and Punnett squares to make correct predictions about probabilities for offspring genotypes and phenotypes including single trait crosses.
Fruit Fly Lab
Part 1
2
This section practices the basics of Punnett Square theory for application later in the activity.
Drosophila melanogaster is the scientific name for the small fly found near fruit and commonly referred to as a fruit fly.
Fruit flies are used in genetic research as a model organism because they have a short life cycle, are small and easy to work with and produce a large number of offspring.
To start this activity we will explore a wing phenotype.
Here you can see two different phenotypes in wings:
Part 1: Punnett Square Practice - Fruit Fly Wings
Normal Wings in fruit flies results from a dominant allele, we will assign this trait the letter "R".
A dominant phenotype appears in the presence of at least one dominant allele.
There are two possible genotypes that confer this normal wing phenotype:
homozygous: RR
heterozygous: Rr
Both RR and Rr genotypes result in the dominant phenotype, normal wings.
Vestigial wings in fruit flies are a recessive trait. As a recessive trait this phenotype will appear only in the absence of the dominant allele.
There is one possible genotypes that confer this vestigial wing phenotype:
homozygous: rr
In this section you will use Punnett squares to predict the theoretical results of various crosses.
3
Multiple Choice
Use this Punnett Square to answer the following questions.
1. Which of the following describes the phenotypes of the parents?
Both parents have normal wings.
One has normal wings and one has vestigial wings.
Both parents have vestigial wings.
4
Multiple Choice
Use this Punnett Square to answer the following questions.
2.Which of the following are possible genotypes that result from Cross #1?
rr
RR
Rr
5
Multiple Choice
Use this Punnett Square to answer the following questions.
3.What is the predicted genotype ratios or percentages that result from Cross #1?
75% RR & 25% rr
100% RR
50% RR & 50% Rr
100% rr
50% Rr & 50% rr
6
Multiple Choice
Use this Punnett Square to answer the following questions.
4.Which of the following are predicted phenotypes that result from Cross #1?
Hint: Phenotype means the physical expression of the trait or what you would see.
Vestigial winged flies
Normal winged flies
7
Multiple Choice
Use this Punnett Square to answer the following questions.
5.What would be the predicted phenotype ratios that result from Cross #1?
0% Normal wings and 100% Vestigial wings
75% Normal wings and 25% Vestigial wings
100% Normal wings and 0% Vestigial wings
50% Normal wings and 50% Vestigial wings
8
We will be using this Punnett square for the next few questions.
Now, let's look at a parent cross #2.
9
Multiple Choice
Use this Punnett Square to answer the following questions.
6.Which of the following describes the phenotypes of the parents in Cross #2?
Both parents have vestigial wings.
One has normal wings and one has vestigial wings.
Both parents have normal wings.
10
Multiple Select
Use this Punnett Square to answer the following questions.
7.Which of the following are possible genotypes that result from Cross #2? Select all that apply.
RR
Rr
rr
11
Multiple Choice
Use this Punnett Square to answer the following questions.
8.What are the predicted genotype ratios or percentages that result from Cross #2?
Hint: Remember each Punnett square represents 25%.
100% RR
50% RR & 50% Rr
50% Rr & 50% rr
75% Rr & 25% rr
25% RR & 75% Rr
12
Multiple Choice
Use this Punnett Square to answer the following questions.
9.Which of the following are predicted phenotypes that result from Cross #2?
Hint: Phenotype means the physical expression of the trait or what you would see.
Vestigial winged flies
Normal winged flies
13
Multiple Choice
Use this Punnett Square to answer the following questions.
10.What are the predicted phenotype ratios that would result from Cross #2?
Hint: Remember each Punnett square represents 25%.
0% Normal wings and 100% Vestigial wings
75% Normal wings and 25% Vestigial wings
25% Normal wings and 75% Vestigial wings
50% Normal wings and 50% Vestigial wings
100% Normal wings and 0% Vestigial wings
14
Now, let's look at the 4th parent combination.
We will be using this Punnett square to answer the next few questions
Let's do 2 more!
15
Multiple Choice
Use this Punnett Square to answer the following questions.
11.Which of the following describes the phenotypes of the parents in Cross #4?
Both parents have vestigial wings.
Three have normal wings and one has vestigial wings.
Both parents have normal wings.
16
Multiple Select
Use this Punnett Square to answer the following questions.
12.Which of the following are possible genotypes that result from Cross #4? Select all that apply.
RR
Rr
rr
17
Multiple Choice
Use this Punnett Square to answer the following questions.
13.What are the predicted genotype ratios or percentages that result from Cross #4?
Hint: Remember each Punnett square represents 25%.
100% RR
50% RR & 50% Rr
50% Rr & 50% rr
75% Rr & 25% rr
25% RR, 50% Rr, & 25% rr
18
Multiple Select
Use this Punnett Square to answer the following questions.
14.Which of the following are predicted phenotypes that result from Cross #4?
Hint: Phenotype means the physical expression of the trait or what you would see.
Vestigial winged flies
Normal winged flies
19
Multiple Choice
Use this Punnett Square to answer the following questions.
15.What are the predicted phenotype ratios that would result from Cross #4?
Hint: Remember each Punnett square represents 25%.
0% Normal wings and 100% Vestigial wings
75% Normal wings and 25% Vestigial wings
25% Normal wings and 75% Vestigial wings
50% Normal wings and 50% Vestigial wings
100% Normal wings and 0% Vestigial wings
20
Now, let's look at the 6th parent combination.
We will be using this Punnett square to answer the next few questions
Last One!
21
Multiple Choice
Use this Punnett Square to answer the following questions.
16.Which of the following describes the phenotypes of the parents in Cross #6?
Both parents have vestigial wings.
One has normal wings and one has vestigial wings.
Both parents have normal wings.
22
Multiple Choice
Use this Punnett Square to answer the following questions.
17.Which of the following are possible genotypes that result from Cross #6?
RR
Rr
rr
23
Multiple Choice
Use this Punnett Square to answer the following questions.
18.What are the predicted genotype ratios or percentages that result from Cross #6?
Hint: Remember each Punnett square represents 25%.
100% RR
50% RR & 50% Rr
50% Rr & 50% rr
100% rr
25% RR, 50% Rr, & 25% rr
24
Multiple Choice
Use this Punnett Square to answer the following questions.
19.Which of the following are predicted phenotypes that result from Cross #6?
Hint: Phenotype means the physical expression of the trait or what you would see.
Vestigial winged flies
Normal winged flies
25
Multiple Choice
Use this Punnett Square to answer the following questions.
20.What are the predicted phenotype ratios that would result from Cross #6?
Hint: Remember each Punnett square represents 25%.
0% Normal wings and 100% Vestigial wings
75% Normal wings and 25% Vestigial wings
25% Normal wings and 75% Vestigial wings
50% Normal wings and 50% Vestigial wings
100% Normal wings and 0% Vestigial wings
26
Multiple Choice
Which wing trait is the dominant trait and which is the recessive?
Normal wing length is the dominant trait. Vestigial wing length is the recessive trait.
Vestigial wing length is the dominant trait. Normal wing length is the recessive trait
27
Multiple Choice
Select the key that correctly describes the genotypes and phenotypes for the wing form trait.
RR is normal wing length
Rr is normal wing length
rr is vestigial wing length
RR is vestigial wing length
Rr is vestigial wing length
rr is normal wing length
Students will use descriptions of individual genotypes and phenotypes to construct a key and Punnett squares to make correct predictions about probabilities for offspring genotypes and phenotypes including single trait crosses.
Fruit Fly Lab
Part 1
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