An investigator determines that gene c and gene f are linked on chromosome 5 of

Question

An investigator determines that gene c and gene f are linked on chromosome 5 of the honeybee genome. Bees that are homozygous for the dominant wild-type alleles have long stingers (c+c+) and bi-lobed wings (f+f+). Bees that are homozygous for the recessive mutant alleles have short stingers (cc) and tri-lobed wings (ff). The parent generation was composed of homozygous dominant male bees (c+c+f+f+), and homozygous recessive females (ccff), which produced a heterozygous F1 generation. Male bees from the F1 generation (c+cf+f) were mated in a testcross with homozygous recessive females (ccff). The testcross produced the F2 generation. The resulting phenotypic ratios in the F2 generation were as follows: Long stingers and bi-lobed wings (362); short stingers and tri-lobed wings (348); long stingers and tri-lobed wings (151); and short stingers and bi-lobed wings (139). Based on the recombination frequency of this cross, what is the map distance between the c and f genes?

Explanation / Answer

29 map units distance between c and f genes = Long stingers and bi-lobed wings (362);-----parental short stingers and tri-lobed wings (348); long stingers and tri-lobed wings (151); short stingers and bi-lobed wings (139 =((151+139)/1000) x 100 = = 29 m.u

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