Three gene loci A, B and C are all located on chromosome Z in corn. The map belo

Question

Three gene loci A, B and C are all located on chromosome Z in corn. The map below indicates the map distances of these loci. The interference between these genes in 0.4. The recessive mutant alleles of these loci and designated a, b, and c. A pure-breeding triple recessive corn plant (a, b, c) was crossed with a corn plant homozygous for the wild-type traits. The resulting F1 plant was testcrossed with a triple homozygous recessive plant and 1000 progeny were counted. List the expected phenotypic classes of progeny, the cross-over class each represents, and the expected # of progeny in that class.

Explanation / Answer

Different Phenotype classes are

Parental: ABC & abc = 453 & 410

Double cross overs: AbC & aBc = 5 & 8

Single cross over between A&B: Abc & aBC = 50 & 57

Single cross overs between B & C: ABc & abC = 9 & 8

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