In tomato plants, three genes are suspected to be linked on the same chromosome. A true-breeding tall plant with smooth fruit that had normal shape was mated to a true- breeding dwarf plant that had peachy fruit with oblate shape. All the F1 progeny were tall with smooth fruit that had a normal shape. You performed a test cross with an F1 plant and observed the following phenotypes in the F2 progeny. 155 dwarf, peach, oblate
151 tall, smooth, normal
33 tall, smooth, oblate
29 dwarf, peach, normal
12 dwarf, smooth, normal
11 tall, peach, oblate
2 tall, peach, normal
0 dwarf, smooth, oblate
A) Perform a chi-square statistical analysis to determine if the tall and smooth genes are segregating according to the law of independent assortment.
B) What are the parental phenotypes and what are the recombinant phenotypes?
C) Construct a genetic map that shows the order of these three genes and the distances between them.