FRUIT FLY GENETICS

DO NOW TUESDAY Let’s see what you remember. Give the genetics term that describes each of the following: a) AA b) Aa c) Aa d) Red flowers e) A f) a

DO NOW TUESDAY Complete the following a) If black fur is dominant (B) and white fur is recessive (b), write the genotype for a heterozygous rabbit. b) Write the genotype for a white rabbit. c) Cross the rabbits from parts a and b using a Punnett square. d) Give the expected genotypic and phenotypic percentages and ratio n the offspring.

TODAY’S PLAN To explain what is meant by phenotype/genotype. To define heterozygous, homozygous, dominant, and recessive. To explain the results of a genetic cross (Punnett Square). TODAY’S DO We will finish the class survey from yesterday. We will practice a few Punnett Squares. We will begin the Alien Genetics Activity.

Class Survey (Pages 86-87) DATA TABLE Total Number ______________ Trait 1 Number of students Trait 2 Number of Students A Free ear lobesAttached earlobes B Hair on fingers No hair on fingers C Widow’s peakNo widow’s peak D Curly hairStraight hair E Cleft chinNo cleft chin F Smile dimplesNo smile dimples Your # from the circle on page 87:

DO NOW MONDAY Cross the following parents and give the genotypic and phenotypic results. Sepia eyes in fruit flies are recessive (e), while red eyes (E) are dominant. Cross a homozygous red-eyed fly with a homozygous sepia-eyed fly. Ee

TODAY’S PLAN To explain the results of a genetic cross (Punnett Square). TODAY’S DO We will complete the Alien Genetics Activity.

DO NOW TUESDAY Give some reasons why fruit flies are ideal organisms to use to study genetics.

TODAY’S PLAN Explain the results of a genetic cross (Punnett Square). Explain why fruit flies are ideal for studying genetics. Identify specific genetic traits of fruit flies. TODAY’S DO We will begin a Web Quest to help you learn more about genetics and fruit flies.

March Madness Fruit Fly Style 1 st Round Move the recessive trait on to the next round 2 nd Round Move the trait found on the lower numbered chromosome on to the next round Semifinal Round (Round 3) Move the trait that is NOT sex-linked on to the next round Final Round (4 th Round) The trait with the longer gene is the winner! Best resource to use is In the quick search box, click on the Data Class tab. Set the parameters to Species (Dmel only), Search (ID/Symbol/Name), Data Class (genes). The first name of the specific trait being searched should be placed in the Enter Text box, then click Search. There will be a highlighted blue bar at the middle/bottom of the screen that shows the length of the gene.

DO NOW THURSDAY Describe the P generation, F1 generation, and F2 generations from Mendel’s experiments.

P generation Parents- pure breeding- homozygous dominant (RR) with dominant phenotype and homozygous recessive (rr) with recessive phenotype RR x rr

F1 generation Offspring- hybrids- heterozygous (Aa)- all dominant phenotypes and NO recessive phenotypes 

F2 generation Offspring of F1- 3:1 phenotypic ratio- 3 dominant phenotypes to 1 recessive phenotype- corresponds to a cross between 2 heterozygous individuals. dominant recessive

TODAY’S PLAN To explain the results of a genetic cross (Punnett Square). To identify specific genetic traits of fruit flies. To use a specific trait of fruit flies to study inheritance. TODAY’S DO We will discuss specific traits of fruit flies, including how to distinguish males and females. We will observe and record data for our P and F1 generations. We will prepare the cross of our F1 generation to produce our F2 generation.

“Sexing” Fruit Flies “Sexing” means to distinguish between male and female fruit flies. Turn the fly so that it is laying on its back. A female will have a light colored end. A male will have a dark colored end. Also, females are generally larger than males.

Wild type “Normal” Fruit Flies Red eyes Long wings Bristles on back Light colored body

Mutations in Fruit Flies White eyes Sepia Eyes

Mutations in Fruit Flies Apterous (wingless) wings Vestigial wings Miniature wings

Mutations in Fruit Flies Ebony body Stubble bristles

DO NOW FRIDAY Is your fruit fly mutation dominant or recessive? Explain how you know. Hint: Consider what you saw in the F1 flies yesterday.

TODAY’S PLAN To explain the results of a genetic cross (Punnett Square). TODAY’S DO We will complete a Genetics Gizmo on the Chromebooks. Username: 2016bcmsscience Password: bcmsscience Find Gizmo: Mouse Genetics (One Trait)

(Maggots)

Predictions If your apterous mutation is inherited as a recessive (a) trait, let’s make some predictions about what we should see in the F2 generation. F2 Expected Genotypic Ratio: F2 Expected Phenotypic Ratio: