Assume that investigators crossed a strain of flies

| August 31, 2017

Question
Chromosome mapping and coefficient of coincidence

Assume that investigators crossed a strain of flies carrying the dominant eye mutation Lobe on the second chromosome with a strain homozygous for the second chromosome recessive mutations smooth abdomen and straw body. The F1 Lobe females were then backcrossed with homozygous smooth abdomen, straw body males and the following phenotypes were observed:

smooth abdomen, straw body 820

Lobe 780

smooth abdomen, Lobe 42

straw body 58

smooth abdomen 148

Lobe, straw body 152

(a) Give the gene order and map units between these three loci – draw the map!.

(b) What is the coefficient of coincidence?

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