A fish geneticist wants to know whether inheritance of lip shape (curved is dominant over straight)and the inheritance of scale shape (flat is dominant over ridged) are controlled by two different gene loci on different chromosomes. If so, then offspring of two heterozygous fish (each with two versions of the gene for lip shape and two versions of the gene for scale shape) will occur in a 9 : 3 : 3 : 1 ratio. She does the cross and examines 1 60 offspring, finding that 72 have curved lips and flat scales, 38 have curved lips and ridged scales, 32 have straight lips and flat scales, and 1 8 have straight lips and ridged scales. Do a chi-square test at a = 0.05, using a critical-value decision rule, of Ho : The distribution of traits is a 9 : 3 : 3 : 1 ratio.
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