You Have Isolated Five Mutations (1 to 5) in the Yeast

question 42

Multiple Choice

You have isolated five mutations (1 to 5) in the yeast Saccharomyces cerevisiae that make the haploid cells unable to grow in the absence of histidine. Each haploid mutant can be mated with any of the other ones, forming diploid cells that either can (+) or cannot (-) grow in the absence of histidine, as indicated in the following complementation table. How many complementation groups do these mutations represent? Each complementation group typically corresponds to a separate gene.

• A) 1
• B) 2
• C) 3
• D) 4
• E) 5

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Definitions:

Negatively Correlated

A relationship between two variables in which one variable increases as the other decreases.

Expected Value

A calculation in statistics that quantifies the average outcome of a random event over a large number of occurrences.

Mean

The average value of a set of numbers, calculated by dividing the sum of all values by the number of values.

Risk Aversion

A preference for safer investments, avoiding risk even at the expense of lower potential returns.