Biologia

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BioLab•Fly Genetics Problems
Name ____________________________
Date_________________ Period _____
1.

Circle those gene sets that are alleles. Double-circle those gene sets that are homozygous.Ww
Gg

ZZ
tT

HK
BB

Mh
AB

mM
Zs

Uu
pp

ww
rr

QQ
Ey

ss
ys

Uy
kn

Use the following information to answer questions 2-4. In fruit flies, normal wings (W)
aredominant to vestigial wings (w).
2.

A pure, normal-winged fly is crossed with a pure, vestigial-winged fly. Complete the following:
a.
b.

3.

Parental genotypes:

Normal-winged parent _____Vestigial-winged parent _____

Use the Punnett square to predict the possible genotypes of offspring:

A pure, normal-winged fly is crossed with a heterozygous fly. Complete the following:
a.
b.4.

Parental genotypes:

Normal-winged parent _____ Heterozygous parent _____

Use the Punnett square to predict the possible genotypes of offspring:

Two heterozygous parents are crossed.Complete the following:
a.

Parental genotypes:

Heterozygous parent _____ Heterozygous parent _____

b.

Use the Punnett square to predict the possible genotypes of offspring:

BioLab•Fly |Copyright ©1997, Bob Doltar | Page 1 of 2

Use the following information to answer questions 5-8. In fruit flies, the gene for red
eye color is sex-linked (located on the X chromosome). Males,with just one X chromosome, will only have one allele for this gene on the X chromosome, while females will have
two alleles. Red eyes are dominant to white eyes.
5.

A homozygous, red-eyed femalefly is crossed with a red-eyed male. Complete the following:
a.

Parental genotypes:

Male parent _____ Female parent _____

b.

Use the Punnett square to predict the possible genotypes ofoffspring:

6. A white-eyed female fly is crossed with a red-eyed male. Complete the following:
a.
b.

7.

Parental genotypes:

Male parent _____ Female parent _____

Use the Punnett square...
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