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The Inheritance of Mutant Traits

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The Inheritance of Mutant Traits. Drosophila Culturing. Objective. Determine the pattern of inheritance of mutant traits in Drosophila melanogaster (fruit flies). The pattern of inheritance will either show... incomplete dominance or reveal the dominant and recesssive strains

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Presentation Transcript
slide2
Objective

Determine the pattern of inheritance of mutant traits

in Drosophila melanogaster (fruit flies)

  • The pattern of inheritance will either show...
    • incomplete dominance or reveal the dominant
    • and recesssive strains
    • sex linkage or autosomal inheritence
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Why Fruit Flies?

Takes up little space

Produce numerous

offspring

Many genes to

study & experiment

Easy to Culture

Low rate

of mutations

New generation

every 2 - 3 weeks

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adult male

adult female

Drosophila Life Cycle

Egg

Larva

Pupa

Adult

slide5
Sex Determination in Drosophila:

Comparing Abdomens

Female

Male

Males

smaller, rounder abdomen

dark posterior

generally smaller

sex combs

Females

large pointed abdomen

light posterior

generally larger

no sex combs

Male Sex Combs

Sex combs

on front legs

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Mutant Traits:

Normal:

Apterous

White eyes

Wild type

Vestigial

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Wild

(normal wings)

Vestigial wings

P1 Crosses:

X

Wild

(normal wings)

Wild

(red eyes)

White eyes

Apterous (wingless)

X

X

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