A piece of DNA which controls a trait is a gene variations of a gene are called alleles. If you mean "controls how much a particular trait is expressed" then you would be dealiung with the promoter region of a gene which is near the start and controls how strongly a gene is expressed.
The least number is 2, however this is very rare. Most traits require many genes to produce a trait.
A psychologist would conduct a twin study to determine the heritability of a trait. By comparing the similarities between identical twins (who share 100% of their genes) with fraternal twins (who share 50% of their genes), researchers can estimate the genetic contribution to the trait.
When multiple genes determine the phenotype of a trait, this is an example of polygenic inheritance. In polygenic traits, several genes contribute to the overall phenotype, often resulting in a continuous range of variability rather than distinct categories. This type of inheritance is common for traits such as height, skin color, and weight, where many different alleles interact to influence the final expression of the trait.
The genes an organism has for a trait are referred to as its genotype. The genotype consists of the specific alleles inherited from its parents that determine the expression of that trait. These alleles can be dominant or recessive, influencing how the trait is manifested in the organism's phenotype, which is the observable characteristic. Understanding an organism's genotype is crucial for studying inheritance patterns and predicting traits in future generations.
epistasis
the number of genes that usually determine a trait
genes
Each hereditary trait corresponds to a specific gene or set of genes that encode the information for that trait. Genes are segments of DNA that determine specific characteristics, such as eye color or height. These genes are inherited from our parents and are responsible for the variation we see in physical attributes and other traits among individuals.
It depends. Some genes determine a single trait all by themselves. Some genes work with other genes to make a trait. It takes several separate genes to determine how tall you will be. And then there are other genes that by themselves determine multiple traits. Each gene is the code for a peptide chain. Many of those become proteins.
The least number is 2, however this is very rare. Most traits require many genes to produce a trait.
An inherited trait is typically determined by multiple genes working together. The exact number of genes involved can vary depending on the trait. In many cases, dozens to hundreds of genes may contribute to a single inherited trait.
genetic traits
It is called polygenic inheritance.
Trait is a characteristic like: tall, short, black eyes, blue eyes Trait is determine by the genes: your gene is a little section on chromosome. A gene that control 1 trait usually have 2 alleles, for ex: Blue eyes is : Bb (b or B are the alleles make up the gene that determine the trait.) hope this help for whoever confuse!
A psychologist would conduct a twin study to determine the heritability of a trait. By comparing the similarities between identical twins (who share 100% of their genes) with fraternal twins (who share 50% of their genes), researchers can estimate the genetic contribution to the trait.
Alleles are pairs of genes that determine a specific trait in an organism. Each parent contributes one allele, and the combination of alleles determines how the trait is expressed. If the alleles are the same (homozygous), the trait will be expressed in a certain way. If the alleles are different (heterozygous), one allele may be dominant and determine the trait's expression, while the other may be recessive and not expressed.
The gametes (sex cells) that combine to form a new organism in sexual reproduction each contain one set of the instructions for the genes of the new organism, that is, one set each for each trait.