Genetics: Analysis and Principles 5th Edition by Robert Brooker

Exercise 3

Three recessive traits in garden pea plants are as follows: yellow pods are recessive to green pods, bluish green seedlings are recessive to green seedlings, creeper (a plant that cannot stand up) is recessive to normal. A true-breeding normal plant with green pods and green seedlings was crossed to a creeper with yellow pods and bluish green seedlings. The F 1 plants were then crossed to creepers with yellow pods and bluish green seedlings. The following results were obtained:
2059 green pods, green seedlings, normal
151 green pods, green seedlings, creeper
281 green pods, bluish green seedlings, normal
15 green pods, bluish green seedlings, creeper
2041 yellow pods, bluish green seedlings, creeper
157 yellow pods, bluish green seedlings, normal
282 yellow pods, green seedlings, creeper
11 yellow pods, green seedlings, normal
Construct a genetic map that describes the map distance between these three genes.