Chapter 13, Problem 26P

In the tomato, Solanumesculentum, tall ( $\text{D-}$) is dominant to dwarf (dd) plant height, smooth fruit ( $\text{P-}$) is dominant to peach fruit (pp), and round fruit shape ( $\text{O-}$) is dominant to oblate fruit shape (oo). These three genes are linked on chromosome 1 of tomato in the order $\text{dwarf–peach–oblate}$. There are $12$ map units between dwarf and peach and $17$ map units between peach and oblate. A trihybrid plant ( $\text{DPO/dpo}$) is test-crossed to a plant that is homozygous recessive at the three loci ( $\text{dpo/dpo}$). The accompanying table shows the progeny plants. Identify the mechanism responsible forthe resulting data that do not agree with the established genetic map.

Progeny Phenotype	Number
Tall, smooth, round	$473$
Dwarf, peach, oblate	$476$
Tall, smooth, oblate	$12$
Dwarf, peach, round	$8$
Tall, peach, oblate	$17$
Dwarf, smooth, round	$13$
Tall, peach, round	$0$
Dwarf, smooth, oblate	$1$
	$1000$