Characteristics of continuous variation include all of the following except

Explanation

This question is asking about the characteristics of continuous variation. Continuous variation is when there is a wide range of possible values for a trait, rather than just a few discrete options. The question asks which of the following is not a characteristic of continuous variation. Option A says that continuous variation is produced by many genes, but this is actually a characteristic of continuous variation. This means that many different genes can influence the trait, leading to a wide range of possible values. Option B says that continuous variation is influenced by the environment, and this is a true characteristic of continuous variation. The environment can play a role in determining the trait, such as with height or weight. Option C says that continuous variation occurs in a normal distribution curve, and this is also true. A normal distribution curve is a bell curve shape that shows the range of values for a trait in a population. Option D says that most of the organisms in the population fall at the tail ends of the range, but this is not a characteristic of continuous variation. Instead, it is a characteristic of bimodal variation, where there are two distinct groups of values for a trait. Therefore, the correct answer is option A, which is Produced by many genes. This is not a characteristic of bimodal variation, but it is a characteristic of continuous variation.