Question

Drosohpila Punnet Square of Crosses

Make Punnet Squares of the following crosses and explain why the results are so,

Which allele is heterozygous and which is homozygous , which is dominant and which is recessive

Part A

Drosophila Female Ebony cross Male Vesitgal Wings

Drosophila Male Ebony cross Female Vesitgal Wings

Part B

Drosophila Female Wild Type cross Male Star Eye

Drosophila Male Wild Type cross Female Star Eye


More Information: x- linked inheritance

Answer 1

A) Ebony = W (dominant), Vestigial = vg (Recessive)

Male ( W vg) * Wvg (Female)

gametes= Wvg

Female	W (male)	vg (male)
W	WW	Wvg
vg	Wvg	vgvg

WW= homozygous Dominant ; phenotype =Ebony

Wvg= hetrozygous Dominant ; phenotype =Ebony

vgvg= homozygous recessive ; phenotype =vestigial

Part B

Drosophila Female Wild Type ( XX) cross Male Star Eye (X*Y)

Female	X* (male)	Y(male)
X	XX*	XY
X	XX*	XY

Genotype = Female XX*, Male XY

Phenotype = all normal

Part B

Drosophila Male Wild Type (XY) cross Female Star Eye (X*X*)

Female	X* (male)	Y(male)
X*	X*X*	X*Y
X*	X*X*	X*Y

phenotype = all star eye