Download Slide 1

Title: Fornicating Fruit Flies
Introduction: Today, you and a partner will generate and observe
fruit fly offspring (babies) by mating a male and female fruit fly
(species name: Drosophila melanogaster). Fruit flies are commonly
used in genetics, the study of genes and patterns of inheritance.
Inheritance is the passing of genes and traits from parent to
offspring.
Organisms reproduce or produce new offspring using one of two
methods: sexual or asexual reproduction. Most animals, like
humans and fruit flies, generate offspring by sexual reproduction.
The offspring from sexual reproduction inherit genetic information
from two different organisms. In contrast, the offspring of asexual
reproduction only inherit genetic information from one parent.
Some organisms are able to do both!
Pre-Lab Questions:
1) Offspring is a different word for _______
a. Parents b. Babies c. Genes d. reproduction
2) _______ is the passing down of genes from parent to offspring.
a. Genetics b. Reproduction c. Inheritance d. Offspring
3) How is inheritance different in asexual and sexual reproduction?
Drosophila Traits
Dominant Allele
Recessive Allele
R = red eyes
r = white eyes
A = curly wings
a = straight wings
B= long , thin bristles
b=short, forked
bristles
Y = tan body
y = yellow body
Sexual Reproduction Data:
Offspring
Genotype
Phenotype
Example
Rr, aa, BB, Yy
Red eyes, straight wings, long
bristles, tan body
1
2
3
4
Asexual Reproduction Data:
Offspring from asexual reproduction inherit _______________
Offspring
____________________________________________________, while
1
Offspring from sexual reproduction inherit ________________
__________________________________________________________.
2
Genotype
Phenotype
Chromosomes
Nucleus