The number of phenotypes for a certain trait is usually influenced by the number of genes that control the trait. It can either be a single-gene trait or a polygenic trait. … Each gene trait is influenced or controlled by two or three phenotypes.
What determined the number of phenotypes for a given trait?
An organism’s phenotype is determined by its genotype, which is the set of genes the organism carries, as well as by environmental influences upon these genes.
What factors determine the phenotype?
Phenotype is the observable physical or biochemical characteristics of an individual organism, determined by both genetic make-up and environmental influences, for example, height, weight and skin colour.
How many genes determine a phenotype?
The collection of all observable and measurable traits of that individual is phenotype. If every position and every function of every cell in our bodies was genetically determined, we would need trillions of genes to specify all that information. Yet, we have only about 26,000 genes.
What are 3 examples of phenotypes?
- Eye color.
- Hair color.
- Sound of your voice.
- Certain types of disease.
- Size of a bird’s beak.
- Length of a fox’s tail.
- Color of the stripes on a cat.
Is Behaviour a phenotype?
A behavioural phenotype refers to observable characteristics that occur more often in individuals with a specific genetic syndrome than individuals without that syndrome. Whilst a behavioural phenotype describes observable behaviour, the term ‘endophenotype’ describes characteristics that are not directly observable.
Is skin color a Mendelian trait?
Traits that display a continuous distribution, such as height or skin color, are polygenic. The inheritance of polygenic traits does not show the phenotypic ratios characteristic of Mendelian inheritance, though each of the genes contributing to the trait is inherited as described by Gregor Mendel.
What are the 3 types of genotypes?
There are three types of genotypes: homozygous dominant, homozygous recessive, and hetrozygous.