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

Given the distances you have calculated for each of the two intervals, how does the number of double crossover individuals compare to the number that would be expected if recombination in the two intervals was completely independent?

Answer 1

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