A Plant-Like Organism on the Planet Pandora Can Have Three

question 56

Multiple Choice

A plant-like 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) :
$$\begin{array} { | l | l | l | l | l | } \hline \text { Phenotypes } & \text { Leaves } & \text { Stems } & \text { Roots } & \text { Number } \\\hline 1 & a & + & + & 14 \\\hline 2 & a & + & c & 0 \\\hline 3 & a &b &+ & 32 \\\hline 4 & a &b& c & 440 \\\hline 5 & + &b& + & 0 \\\hline 6 & + &b& c & 16 \\\hline 7 & + & + & c & 28 \\\hline 8 & + & + & + & 470 \\\hline & & & \text { Total } & 1000 \\\hline\end{array}$$
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Which of the progeny phenotypes will require recombination between genes A and B?

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

Describe how climate affects soil profiles and plant adaptations in various ecosystems.

Identify the relationship between soil profiles and terrestrial ecosystems.

Understand the role of the water cycle in shaping terrestrial and aquatic ecosystems.

Understand the reasons for the incompleteness of the fossil record.

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