Sapling Learning Some traits are considered to be quantitative, even though phen

Question

Sapling Learning Some traits are considered to be quantitative, even though phenotypes are classified only as present or absent. Genetic diseases often fit this description. What is the term used to describe this type of trait? threshold trait O meristic trait O acquired trait O epigenetic trait O polygenic trait What creates the underlying quantitative distribution for this type of trait? Many genes can code for the trait, but only one gene promotes or inhibits expression of the Oothers, resulting in the presence or absence of the trait. There are many alleles for the trait at a single locus. Some of the alleles cause the present phenotype and some cause the absent phenotype. The trait is present or absent, but the severity varies and because measurements are O subjective, the trait is classified only as present or absent. Genetic and environmental factors determine an individual's susceptibility to the trait. Susceptibility exhibits continuous variation, and individuals above a certain threshold express the trait O

Explanation / Answer

Q1) Some gene are considered to be quantitative , even though phenotypes are classified only as present or absent.Genetic disease often fit this description, what is the term used to describe this type of trait-

Answer- A - Threshold trait.

Explanation-

A threshold trait is a trait, which is inherited quantitatively, but is expressed qualitatively. Usually many genes form the basis of a threshold trait, that is why they are called as quantitative trait.

This is a trait which appears phenotypically in one or more different states is genetically determined by one or a few genes. Examples of traits which appear in this way are diseases like pyloric stenosis and club foot.

A Meristic trait is a trait used to count quantitative features of fish, like the number of fins or scales. A meristic trait is used to describe a particular species of fish, or used to identify an unknown species.

Acquired trait:- It is a characteristic or trait which produces a phenotype that is influenced by environment, this trait not inherited genetically.

Epigeentic trait:- It is a trait in which there is changes in chromosome without altering the sequence of DNA.

Polygenic trait- It is a trait in which a character is controlled by a group of genes , when they are expressed together they produce a particular phenotype.examples are height , skin color in human, they are controlled by many genes when they are expresses together they produce a particular type.

Q2) What creates the underlying quantitative distribution of this trait-

Answer- A- Many genes can code for this trait , but only one gene promote or inhibit expression of the other resulting in the presence or absence of the trait.

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