Discontinuous variation

Definition

Discontinuous variation involves traits that show distinct, separate forms with no intermediate states. These traits are often controlled by a single gene or a small number of genes, leading to clear-cut differences among individuals.

5 Must Know Facts For Your Next Test

1. Discontinuous variation results in phenotypes that fall into distinct categories, such as blood type or flower color.
2. Gregor Mendel's pea plant experiments demonstrated discontinuous variation through traits like seed shape and flower color.
3. Traits exhibiting discontinuous variation are typically influenced by one or a few genes with large effects.
4. Environmental factors have minimal influence on traits showing discontinuous variation.
5. Discontinuous variation is essential for understanding Mendelian inheritance patterns and predicting offspring phenotypes.

Review Questions

Related terms

Mendelian Inheritance: Patterns of inheritance that follow Gregor Mendel's two laws—law of segregation and law of independent assortment.

Allele:

A variant form of a gene at a particular locus on a chromosome, responsible for different traits.

Phenotype: The observable characteristics or traits of an organism resulting from the interaction of its genotype with the environment.