Use the Following Information to Answer the Question

question 29

Multiple Choice

Use the following information to answer the question.
A plantlike organism on the planet Pandora can have three recessive genetic traits: bluish leaves, due to an allele (a) of gene A; a feathered stem, due to an allele (b) of gene B; and hollow roots due to an allele (c) of gene C. The three genes are linked and recombine.
A geneticist performed a testcross with an organism that had been found to be heterozygous for the three recessive traits, and she was able to identify progeny of the following phenotypic distribution (+ = wild type) :

The greatest distance among the three genes is between a and c. What does this mean?

• A) Gene c is between a and b.
• B) Genes are in the order: a-b-c.
• C) Gene a is not recombining with c.
• D) Gene a is between b and c.

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Definitions:

External Benefit

A positive effect on a party who did not choose to incur that benefit, often associated with public goods or services.

Public‐spirited

Exhibiting a selfless concern for the well-being of the community and the willingness to act for the public good.

Air Pollution

The presence of substances in the atmosphere that are harmful to the health of humans and other living beings or cause damage to the climate or materials.

Medical Care

Services provided by healthcare professionals to diagnose, treat, or prevent diseases and injuries in individuals.