FLY LAB NAME______

Lab One - Monohybrid Cross of a Normal Winged Male and a Vestigial Winged Female

Normal Winged Allele: W (Dominant) Vestigial Winged Allele: w (Recessive)

Crossing - Normal Winged Male with a Vestigial Winged Female

Homozygous vestigial winged female genotype ______

Homozygous normal winged male genotype ______

Normal or
Wild Type
Female / Vestigial Female / Normal or
Wild Type Male / Vestigial
Male

Phenotype Predictions:

_____ All normal winged

_____ All vestigial winged

_____ 50% Normal / 50% Vestigial

_____ 75% Normal / 25% Vestigial

Exp. 1 Results:

______Normal Female

______Vestigial Female

______Normal Male

______Vestigial Male

The offspring produced from the cross between the normal and vestigial winged parents in Lab 1 had the genotype:

100% WW 100% Ww 50% WW / 50% Ww 100% ww

What % of offspring from Lab 1 showed the normal winged phenotype?

100% 75% 50% 25%

Which trait was masked and did not appear in the F1 offspring?

Neither Dominant Normal Wings Vestigial Wings

Which trait was dominant in Lab1?

Neither Both Normal Wings Vestigial Wings

What % of the offspring from a cross between parents with the genotype

Ww and ww would you expect to have normal wings?

100% 75% 50% 25%

Lab Two - Monohybrid Cross of two from the F1 (Normal Winged) generation

Crossing - Normal Winged Male and Female (from Lab 1)

Are these Homozygous or Heterozygous? ______

Normal Winged Female Genotype: ______

Normal Winged Male Genotype: ______

Predictions:

_____ All normal winged

_____ All vestigial winged

_____ 50% Normal / 50% Vestigial

_____ 75% Normal / 25% Vestigial

Exp. 2 Results:

______Normal Female

______Vestigial Female

______Normal Male

______Vestigial Male

The offspring produced from the cross between the heterozygous normal winged parents had the genotype:

100% WW 50% WW 100% ww 50% Ww

What % of offspring had the vestigial winged phenotype?

100% 75% 50% 25%

Which trait was not present in the parent generation?

Vestigial Wings Dominant Normal Wings Neither

Which trait was dominant?

Neither Both Normal Wings Vestigial Wings

What % of offspring from a cross between parents with the genotype WW & ww would you expect to have normal wings?

100% 75% 50% 25%


Lab Three - Sex linked traits - Cross of Normal eyed Male and Female

Crossing - Normal eyed (Red) male and normal red eyed female

Red eyed
Fruit Fly / White Eyed Fruit Fly

Red is Dominant, White is Recessive

Normal Eyed Male Genotype: ______

Normal Eyed Female Genotype: ______

Is the female homozygous or heterozygous? ______

Predictions:

_____ All red eyed offspring

_____ All white eyed offspring

_____ 25% White / 25% Red Males 25% White / 25% Red Females

_____ 25% White / 25% Red Males / 50% Red Females

Exp. 2 Results:

______Normal eyed female

______White eyed female

______Normal eyed male

______White eyed male

Which genotype must the parents have to always yield 100% White eyed females?

XRXr, XrY XRXr, XRY XrXr, XRY XrXr, XrY

The white eyed males produced in Lab 3 had the genotype?

XRY XrY XRXr XRXR

Red eyed males had the genotype?

XRXR XrY XRY XRY or XrY

Red eyed females can have the genotype...

XRXR, XRXr XRXR, XRY XRXR only XRXr only

What parental genotype would always yield 100% red eyed females and 100% white eyed males?

XrXr, XRY XRXr, XrY XRXR, XrY XRXr, XRY


Lab Four - Dihybrid Cross of a Normal Winged & Eyed Male and Female

Normal Eyed Allele: E (Dominant) Sepia Eyed Allele (SE): e (Recessive)

Normal Winged Allele: W (Dominant) Vestigial Winged Allele (VG): w (Recessive)

Crossing - Normal Winged and Normal eyed Male and female

Is sepia eye color sex linked? ______

Are the individuals homozygous or heterozygous for eye color and wing type? ______

Normal Winged; Normal Eyed Male Genotype: ______

Normal Winged; Normal Eyed Female Genotype: ______

Phenotype Predictions:

_____ All normal winged, eyed

_____ All vestigial winged, sepia eyed

_____ 9 Normal for traits; 3 sepia eyes normal wings; 3 Normal eyes vestigial wings; 1 sepia eyes, vestigial wings

_____ 4 Normal; sepia: 4 vestigial wings: 4 sepia eyes, vestigial wings

Exp. 4 Results:

______Normal for both traits

______Sepia Eyed & Normal wings

______Normal eyes & Vestigial Winged

______Sepia Eyed, Vestigial Winged


Which is the most probable genotype of a parent that always yields 100% SE & Normal Winged offspring?

eeWW & EeWw eeWw & Eeww eeWW & eeWw eeWw & eeWw

The Sepia eyed, Normal winged flies had the genotypes...

eeWW & eeWw eeWW & eeww eeww & eeWw EeWw & eeWw

The Normal eyed, Vestigial winged flies had the genotypes...

Eeww& eeWw EEww & Eeww EEWw & Eeww EeWw & EeWw

What traits were recessive?

Sepia eyes Sepia Eyes & Normal Wings Vestigial Wings Sepia Eyes & Vestigial Wings

What would be the most probable phenotypes if a pure bred wild fly was crossed with a sepia eyed vestigial winged fly?

9 Normal for traits; 3 sepia eyes normal wings; 3 Normal eyes vestigial wings; 1 sepia eyes, vestigial wings

4 Normal: 4 sepia: 4 vestigial: 4 sepia,

All Normal

All Sepia eyes and vestigial wings,

1