In Fruit Flies, Red Eyes (R) Are Dominant to Sepia

question 38

Multiple Choice

In fruit flies, red eyes (R) are dominant to sepia eyes (r) , and the presence of wings (A) is dominant to wingless (a) flies. If two flies heterozygous for each trait are crossed (RrAa × RrAa) , how many different phenotypes would be produced in the offspring?

• A)2
• B)3
• C)4
• D)5
• E)9

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Definitions:

Quantitative Research

Research that collects and analyzes numerical data to understand patterns, relationships, or effects.

Standardized Measures

Tools or tests that have been rigorously evaluated for reliability and validity and are administered in a consistent manner across different participants or contexts.

Mixed Method Approach

A research approach that combines quantitative and qualitative methods to gain a better understanding of research questions or problems than using either method alone.

Reliability

The consistency and dependability of a measurement, test, or result when repeated under the same conditions.