What are some examples of discrete variation?

Discrete variation is either/or and is often caused by the presence or absence of a small number if genes. For example, our ability to "roll" our tongues is determined by just one gene. We can all either roll our tongue or not - there's nothing in between.

Are human traits discrete?

Discrete traits (as opposed to continuously varying traits such as height) with simple Mendelian inheritance patterns are relatively rare in nature, and many of the clearest examples in humans cause disorders. Discrete traits found in humans are common examples for teaching genetics.

What is the difference between a continuous trait and a discrete trait?

Quantitative traits are also called continuous traits, and they stand in contrast to qualitative, or discontinuous, traits that are expressed in the form of distinct phenotypes chosen from a discrete set.

Is blood type discrete or continuous trait?

The ABO blood group is another example of a discrete genetic characteristic. In this case there are four possibilities: blood group A, B, AB, or O.

What is a trait?-Genetics and Inherited Traits

Is eye color a discrete trait?

Eye color is an example of polygenic inheritance. This trait is thought to be influenced by up to 16 different genes. Eye color inheritance is complicated. It is determined by the amount of the brown color pigment melanin that a person has in the front part of the iris.

Is height discrete or continuous?

Height, weight, temperature and length are all examples of continuous data.

Is skin color a discrete variation?

Two Kinds of Inherited Variation

Continuous variations are differences in characteristics that have a range of possible variations, such as height, shoe size, hand span, skin color, hair color, etc. Discrete variations are differences in characteristics that have a definite form, with a limited number of possibilities.

Is albinism a discrete or continuous trait?

A discrete trait is a phenotype that manifests as clear and separable differences in a population, while a continuous trait is a phenotype that manifests as a continuum along a spectrum. Examples of discrete traits are dimples and albinism. Examples of continuous traits are height and eye color.

Is eye color a continuous trait?

Previous studies on the genetics of human eye color used broadly-categorized trait information such as 'blue', 'green', and 'brown'. However, variation in eye color exists in a continuous grading from the lightest blue to the darkest brown.

What are continuous and discontinuous traits?

If a characteristic can change gradually, it is continuous. If it can only jump from one category to the next, it's discontinuous.

Are polygenic traits discrete?

Because multiple genes are involved, polygenic traits do not follow Mendel's pattern of inheritance. Instead of being measured discretely, they are often represented as a range of continuous variation. Some examples of polygenic traits are height, skin color, eye color, and hair color.

What is continuous trait?

A continuous trait displays a range of expression (such as weight, height, etc.) rather than an all-or-none appearance (such as white or red). Continuous traits are usually under polygenic control and subject to substantial environmental influence in expression.

Is height a discrete variation?

Height ranges from that of the shortest person in the world to that of the tallest person. Any height is possible between these two extremes. So it is continuous variation.

What is discrete variations?

Characteristics controlled by a single gene (one copy inherited from each parent) tend to have phenotypes that fall into separate categories. They show discrete variation.

Is tongue rolling continuous or discrete?

The ability to roll the tongue, and blood groups, are examples of discontinuous variation.

What's discrete trait?

Definitions. Discontinuous traits - traits with only a few possible phenotypes that fall into discrete classes; phenotype is controlled by one or only a few genes (ex.: tall or short pea plants; red, pink or white snapdragon flowers)

Is weight a continuous trait?

Continuous traits are measured on a continuous numerical scale and include height, weight and milk production. Non-continuous traits cannot be measured on a continuous numerical scale. Examples include meristic traits and threshold traits.

Is hair color a polygenic trait?

Skin and hair color are both what we call polygenic features: they depend on a bunch of different genes working together, with more still being discovered. To make things worse, two people can have all of the same genes but still have different hair colors!

Is hair color continuous or discrete?

Hair colour is a type of discrete data because the values are distinct. You either have one hair colour or another! Continuous data covers a range, so each category is not separate but runs into the next.

Is eye color continuous or discontinuous?

Discontinuous: Eye colour, handedness & lobed/lobeless ears. Continuous: Hand span, arm length & height.

Is hair colour a continuous or discontinuous variation?

And clearly hair color, skin color and eye color all fall under the definition of a continuous trait, because even though they dont seem to be affected by the environment, they are definitely polygenic traits and show a gradation, so they're definitely continuous traits.

Is age discrete or continuous?

Is Age Discrete or Continuous? Technically speaking, age is a continuous variable because it can take on any value with any number of decimal places.

Is heart rate continuous or discrete?

Variables such as heart rate, platelet count and respiration rate are in fact discrete yet are considered continuous because of large number of possible values. Only those variables which can take a small number of values, say, less than 10, are generally considered discrete.