Fruit Fly Species All Look Similar to One Another

question 55

Multiple Choice

Fruit fly species all look similar to one another. If you have a male and a female fruit fly, how can you prove that they are the same species, according to the biological species concept?

• A) If they mate successfully and their offspring are fertile, they are the same species.
• B) Examine them closely with a low- power microscope, comparing their physical characteristics to published species key lists of characteristics.
• C) Determine the base sequence of the DNA of their chromosomes.
• D) If they mate when they are put together, they are the same species.
• E) If they can asexually reproduce and their offspring can also successfully asexually reproduce, they are the same species.

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Definitions:

Internal Validity

Refers to how well an experiment is conducted and whether it measures what it's supposed to measure, without being confounded by other factors.

Independent Variable

A variable in an experiment that is manipulated to observe its effects on a dependent variable.

Internal Validity

The extent to which a study provides evidence that a causal relationship exists between the variables it examines, free from confounding factors.

Random Assignment

Use of a random "chance" procedure (such as a random number generator or coin toss) to determine the condition in which an individual will participate.