Three genes, A B and C, are linked and the genetic distances between them are il

Question

Three genes, A B and C, are linked and the genetic distances between them are illustrated below.

The interference among these three genes is 0.43. A testcross between a cis-heterozygote (AaBbCc) and a homozygous recessive individual (aabbcc) results in the 8 phenotypic classes below. If 1000 individuals were produced by this cross, how many would we expect to belong to each class? Your answers should be whole numbers (no decimals) and expressed numerically (no words).

abc:

ABC:

aBC:

Abc:

abC:

ABc:

aBc:

AbC:

Explanation / Answer

abc: 374 ( parental phenotypes)

ABC: 390 ( parental phenotypes)

aBC: 85 ( due to single crossover between genes a and C)

Abc: 81 ( due to single crossover event between genes A and c)

abC: 8 ( due to double crossover between genes a and C)

ABc: 5 ( due to double crossover between genes A and c)

aBc: 30 ( due to singe crossover between genes a and c)

AbC: 27 ( due to single crossover between genes A and C )

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