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A Triple-Point Testcross of a Plant Is Used to Determine

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Essay

A triple-point testcross of a plant is used to determine the order of linked genes g, t, and l. The wild-type parental phenotypes are green, tall, and leafy, represented by the triple heterozygote g+t+l+/gtl. The mutant plants are red, dwarf, and sparse, represented by the triple recessive genotype gtl/gtl. The least frequent phenotypes in the progeny of the testcross are red, tall, and leafy, and green, dwarf, and sparse. What is the order of the three genes?


Definitions:

Rhegmatogenous

Pertains to a type of retinal detachment that occurs due to a tear or break in the retina, allowing fluid to accumulate under the retina.

Exudative

Pertaining to any fluid that filters from the circulatory system into lesions or areas of inflammation.

Traction

The application of a pulling force to a part of the body to realign or immobilize bones and joints.

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