Scalloped (sd) wing is an X-linked recessive and ebony (e) body color is an autosomal recessive...

Scalloped (sd) wing is an X-linked recessive and ebony (e) body color is an autosomal recessive mutation in Drosophila. What proportion of scalloped, ebony colored females is expected in the F2 starting with a true breeding scalloped female which is wild type for ebony mating with a true breeding male mutant only for ebony.

1/16

3/16

1/8

1/32

Solutions

Expert Solution

Xs = Allele for scalloped wing

X = Allele for normal wing

Ae = Allele for ebony body color

A = Allele for WT body color

Both these mutations are recessive.

Scalloped wing phenotype is X-linked.

Ebony body color is autosomal.

Parental cross: XsXs AA X XY AeAe

Gametes: (XsA) X (XAe) (YAe)

F1 Progeny: XsXAAe XsYAAe

F1 cross: XsXAAe X XsYAAe

Gametes: (XsA) (XsAe) (XA) (XAe) X (XsA) (XsAe) (YA) (YAe)

	(XsA)	(XsAe)	(XA)	(XAe)
(XsA)	XsXsAA – F/s/W	XsXsAAe- F/s/E	XsXAA – F/S/E	XsXAAe – F/S/E
(XsAe)	XsXsAAe – F/s/E	XsXsAeAe – F/s/e	XsXAAe – F/S/E	XsXAeAe – F/S/e
(YA)	XsYAA – M/s/E	XsYAAe- M/s/E	XYAA – M/S/E	XYAAe – M/S/E
(YAe)	XsYAAe – M/S/E	XsYAeAe – M/s/e	XYAAe – M/S/E	XYAeAe- M/S/e

F1 cross: XsXAAe X XsYAAe

Clue for phenotype:

F/S/E = Female-WT wing-WT body colour

F/s/e = Female-Scalloped-Ebony body colour

M/S/E = Male-WT wing-WT body colour

M/s/e = Male-Scalloped-Ebony body colour

Frequency of scalloped, ebony females = 1/16

gladiator answered 1 year ago

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