The following three recessive genes are found in corn. Brittle endosperm (bt1), glossy leaf (gl17), and ragged seedling (rgd1). A tri-hybrid is test-crossed producing the following offspring.
brittle, glossy, ragged 258
brittle, glossy 121
ragged 119
glossy, ragged 26
wild-type 242
brittle, ragged 7
glossy 5
brittle 22
800
a–if the genes are linked, determine the relative order and map distances (both measured and actual).
b–what is the coefficient of coincidence for double crossovers.
c–Is there any crossover interference? If so, how much?
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