Question

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

(a) What are the genotypes of the two parental chromosomes in the triply heterozygote parent?

Answer 1

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