The expression of a trait depends on genetic factors, environmental factors, and how these factors interact with each other. Genetic factors include the individual's DNA sequence, while environmental factors can include diet, lifestyle, and exposure to external stimuli. The interplay between genetics and the environment can influence how a trait is expressed in an individual.
When the expression of a trait is determined by many different influences, the trait is said to be polygenic. Polygenic traits are influenced by multiple genes, often interacting with environmental factors, leading to a continuous range of phenotypes. Examples include height, skin color, and intelligence, which illustrate the complexity of inheritance and expression in such traits.
This condition is known as polygenic inheritance. It involves multiple genes contributing to a trait, and the expression of these genes can be influenced by environmental factors. The combination of genetic and environmental influences leads to a wide range of variation in the trait.
Phenotype
Allele The specific trait may be either in homozygous or heterozygous condition. The expression of the trait depends on its dominant or recessive condition.
A phenotype will express a recessive trait when an individual has two copies of the recessive allele (homozygous recessive) and no dominant allele to mask its expression. This occurs when both parents contribute a recessive allele, which can happen if both are carriers of the recessive trait or express the trait themselves. Environmental factors can also play a role in the expression of certain traits, but for genetic recessiveness, the key factor is the allele combination inherited from the parents.
The expression of a specific trait in an individual (such as hair color) is determined by two factors,one from each parent. These factors are represented with an uppercase letter for a dominantfactor and a lowercase letter for a recessive factor. The combination of these factors determineshow that trait will be expressed in an individual.
When the expression of a trait is determined by many different influences, the trait is said to be polygenic. Polygenic traits are influenced by multiple genes, often interacting with environmental factors, leading to a continuous range of phenotypes. Examples include height, skin color, and intelligence, which illustrate the complexity of inheritance and expression in such traits.
Environmental factors can influence the expression of a specific trait by affecting how genes are turned on or off. For example, temperature can impact the color of a Himalayan rabbit's fur. In colder areas, the rabbit's fur is darker, while in warmer areas, it is lighter. This shows how the environment can directly affect the expression of a trait.
This condition is known as polygenic inheritance. It involves multiple genes contributing to a trait, and the expression of these genes can be influenced by environmental factors. The combination of genetic and environmental influences leads to a wide range of variation in the trait.
Non-allelic genes are genes located on different chromosomes that do not directly influence each other. They can affect the expression of a specific trait in an organism through independent pathways, leading to a combination of different genetic factors influencing the trait.
That physical trait is known as phenotypic expression.
Phenotype
Allele The specific trait may be either in homozygous or heterozygous condition. The expression of the trait depends on its dominant or recessive condition.
the offspring have two factors for each trait
When one trait cancels out another trait, it is referred to as a relationship of epistasis. Epistasis occurs when the expression of one gene masks or modifies the expression of another gene.
A phenotype will express a recessive trait when an individual has two copies of the recessive allele (homozygous recessive) and no dominant allele to mask its expression. This occurs when both parents contribute a recessive allele, which can happen if both are carriers of the recessive trait or express the trait themselves. Environmental factors can also play a role in the expression of certain traits, but for genetic recessiveness, the key factor is the allele combination inherited from the parents.
False. Mendel's experiments demonstrated that dominant traits mask the expression of recessive traits in heterozygous individuals. This means that the dominant trait is expressed while the recessive trait remains hidden. Thus, the recessive trait does not get expressed when a dominant trait is present.