Use the Following Information to Answer the Questions Below

question 59

Multiple Choice

Use the following information to answer the questions below.
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 as follows:
A geneticist did 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) :

-Which of the following are the phenotypes of the parents in this cross?

• A) 2 and 5
• B) 1 and 6
• C) 4 and 8
• D) 3 and 7
• E) 1 and 2

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Definitions:

Pineal Gland

A small endocrine gland in the brain involved in the regulation of sleep patterns through the secretion of melatonin.

Biological Clocks

Internal mechanisms in organisms that control the timing of biological functions and behaviors, helping to adapt to the day-night cycle.

Hormone

Chemical substances produced in the body that regulate and control the activity of certain cells or organs.

Circadian Rhythm

The internal body clock that regulates the 24-hour cycle of biological processes, including sleep-wake patterns.