With two pairs of genes involved (P/p and Z/z), a testcross (ppzz) with an organism of unknown genotype indicated that the gametes produced were in the following proportions:
PZ, 42.4%; Pz, 6.9%; pZ, 7.1%; pz, 43.6%
Draw all possible conclusions from these data.
HINT: This problem involves an understanding of the proportionality between crossover frequency and distance between genes. The key to its solution is to be aware that noncrossover and cross-over gametes occur in reciprocal pairs of approximately equal proportions.
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