11. An individual heterozygous for four genes, A/a · B/b · C/c · D/d, is testcrossed to a/a · b/b · c/c · d/d, and 1000 progeny are classified by the gametic contribution of the heterozygous parent as follows:
b.If two pure-breeding lines had been crossed to produce the heterozygous individual, what would their genotypes have been?
c.Draw a linkage map of the linked genes, showing the order and the distances in map units.
d.Calculate an interference value, if appropriate.
답 a.All four genes are linked.
b.c.The map is:The parental chromosomes actually were B (A, d) c/b (c, D) C, where the parentheses indicate that the order of the genes within them is unknown.
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