concern a 3-point mapping cross involving the genes for tan body (t), forked bri

Question

concern a 3-point mapping cross involving the genes for tan body (t), forked bristles (f), and yellow eye (y). THESE QUESTIONS ARE NOT BASED ON REAL MAP DISTANCES IN ANY SPECIES.

Let T = normal body color, dominant; and t = tan body, recessive;

F = normal bristles, dominant; and f = forked bristles, recessive; and

Y = normal eye color, dominant; and y = yellow eye color, recessive.

Below is another possible chromosome arrangements for these gene loci. Which phenotypes below would be the double-crossover products from this arrangement of the gene loci?

normal body, forked bristles, normal eyes 2+ 3t Dominant (wild-type) for all traits Recessive (mutant) for all traits Fl for Mapping Cross

Explanation / Answer

if there is a double cross over, It could result Tfy or tfY or tFy

so the answer will be

normal body, forked bristles, yellow eyes or

tan body, forked bristles, normal eyes or

tan body, normal bristles, yellow eyes

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