Problem 2 Butterflies are typical diploid eukaryotes with the following inherite

Question

Problem 2 Butterflies are typical diploid eukaryotes with the following inherited conditions: Crossveins (c+) vs no crossveins (c) Spots (s+) vs no spots (s) Orange colour (o+) vs cream (o) True-breeding c s o are crossed to c+ s+ o+ to produce F1 progeny that are all phenotypically c+ s+ o+. The F1 progeny are mated in a test cross to homozygous cc ss oo butterflies. The F2 offspring are as follows: a. How are the genes transmitted (linked, unlinked, etc.)? b. Determine the map distance between any linked genes.

Explanation / Answer

a)cso 215 non recombinant and c+s+o+ =218(unlinked)

rest linked.

b) map distance,

between c and s= 35+38+38+39/1000 X 100= 150/1000X100=15%

between s and o= 205 +212 +38+39/1000 X 100= 49.4%

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