You examine body weight in a laboratory population of mice. You find that indivi

Question

You examine body weight in a laboratory population of mice. You find that individuals fall into five discrete weight classes with mean weights of 15grams, 20gr, 30 gr, and 35gr. The variance of weight within each class is very low, and the distribution of weights in the different weight classes do not overlap. Based on these observations you would conclude that in this population and enviroment
a) body weight is a quantitative trait
b) body weight is a qualitative trait
c) body weight is affected by many different genes
d) body weight is affected only by environment.
e) a&d

Explanation / Answer

A,is the answer. Continuous traits are quantitative traits with a continuous phenotypic range. They are often polygenic, and may also be influenced significantly by environmental effects.

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