Question

In Drosophila, the recessive mutant allele cinnabar (cn) results in bright red eyes, curved© results in...

In Drosophila, the recessive mutant allele cinnabar (cn) results in bright red eyes, curved© results in curved wings, and plexus (px) results in extra wing veins. All three genes are linked. In a cross between cn c px/+ + + females and cn c px/cn c px males, the following phenotypic classes were observed:

cn c px

296

cn c +

63

cn + +

119

cn + px

10

+ c px

86

+ c +

15

+ + +

329

+ + px

82

TOTAL

1000

(b) Which of the three genes lies between the other two? Show/explain.

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