In the tubular flowers of foxgloves, wild type coloration is red while a mutatio
ID: 19014 • Letter: I
Question
In the tubular flowers of foxgloves, wild type coloration is red while a mutation called white produces white flowers. Another mutation, called peloria, causes the flowers at the apex of the stem to be huge. Another mutation called dwarf, affects stem length. A white flowered plant (otherwise phenotypically wild type) is crossed to a plant that is dwarf and peloria, but has wild type red flower color. All of the F1 plants are tall with white, normal sized flowers. An F1 is now crossed with the dwarf plant, and the offspring are listed below, only mutant traits are noted in the data. UseExplanation / Answer
I
In the F1 you observe white (dominant ) tall (dominant) and normal flower size normal (dominant)
Draw a map showing the linkage relationships of these three loci?
Parental linkage is and dco are
d + +
d p +
+ + w
+ p w
d to p _ d+ and +p
dwarf, peloria d p + 172
white + + w 162
dwarf, peloria, white d p w 56
wild type + + + 48
dwarf, white d + w 51
peloria + p + 43
dwarf d ++ 6
peloria, white + p w 5
19.33 d—p
21.17 p – w
---d---------------19.33------------------p-------------19.33-----------------w---
Yes the expected number of dco is 22 and the observed is 11. 11/22 = .5 for co
and interference is 50%