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Welcome to the World of Fruit Fly Genetics

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Welcome to the World of Fruit Fly Genetics. This is a *female* fruit fly Notice the tiger-striped abdomen and the simple tag-like tip on the abdomen. The tip at the end of the female abdomen is the excretory opening. Just proximal to this opening is the female genital opening. Female

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Presentation Transcript
slide1

Welcome to the Worldof

Fruit Fly Genetics

slide3

This is a *female* fruit fly

Notice the tiger-striped abdomen and the

simple tag-like tip on the abdomen.

slide4

The tip at the end of the female abdomen is the excretory opening.

Just proximal to this opening is the female genital opening.

Female

Genitalia

slide5

This is a mature male fruit fly

Mature males have a prominent black abdominal end.

Males also have tiny “sex combs” on their front pair of legs.

slide6

Here’s a close up of the male genital region.

Notice the metallic sheen of the genitals.

slide7

One male and one female

Find their distinguishing features.

slide8

Ventral view of a male and female

Find their distinguishing features

slide10

Notice the relatively larger size and

lighter pigmentation

of the

virgin female as compared with the

mature female

slide11

Tiny fly eggs hatch into tiny worm-like larvae. The larvae eat and grow in length

and girth. The maximum size

of the larval stage is called

the third instar.

This larval stage

becomes a pupa.

Anus

This is a third instar larva

prior to pupation

Mouth

larva to pupa stages
Larva to Pupa Stages

Larvae are mobile

Pupal

stages

With the onset of pupation the worm-like larva contracts and a

parchment-like pupa case hardens around the metamorphosing fly.

fly metamorphosis in pupa
Fly metamorphosis in pupa

When the fly emerges from the

pupal case the wings are still

wet and folded.

slide14

When flies are newly hatched

their wings are still damp

and folded.

Is this a male

or a female?

This is a male.

Pigmentation has not developed.

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