Can multiple genes affect a phenotype?

Can multiple genes affect a phenotype?

A polygenic trait is one whose phenotype is influenced by more than one gene. Traits that display a continuous distribution, such as height or skin color, are polygenic.

How do genes affect phenotype?

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. Phenotypes also include observable characteristics that can be measured in the laboratory, such as levels of hormones or blood cells.

What happens when a trait has multiple alleles?

Although humans (and all diploid organisms) can have only two alleles for any given gene in genetics, multiple allele traits may exist at the population level. Thus, multiple alleles are important in promoting variation within the same species.

Does each gene influence only one phenotypic trait?

A pleiotropic gene is a single gene that controls more than one trait. The term pleiotropy is derived from the Greek words pleio, which means “many,” and tropic, which means “affecting.” Genes that affect multiple, apparently unrelated, phenotypes are thus called pleiotropic genes (Figure 1).

What is genotype and phenotype how does it affect the traits?

Genotype versus phenotype. An organism’s genotype is the set of genes that it carries. An organism’s phenotype is all of its observable characteristics — which are influenced both by its genotype and by the environment. For example, differences in the genotypes can produce different phenotypes.

What is the relationship between genotype and phenotype?

The genotype of an organism is defined as the sum of all its genes. The phenotype of an organism is the observable physical or biochemical characteristics of an organism, determined by both genetic make-up and environmental influences.

What is the relationship between your genotype and phenotype?

An organism’s genotype is the set of genes in its DNA responsible for a particular trait. An organism’s phenotype is the physical expression of those genes.

What will be the phenotype and genotype of an organism when both genes are dominant?

Recessive alleles only express their phenotype if an organism carries two identical copies of the recessive allele, meaning it is homozygous for the recessive allele. This means that the genotype of an organism with a dominant phenotype may be either homozygous or heterozygous for the dominant allele.

How do multiple alleles affect phenotype?

Having more than 1 or 2 alleles for a trait can greatly increase the number of phenotypes, depending on the trait’s specific pattern of inheritance. For example, human blood type is controlled by 3 alleles (just referring to the ABO blood groups here): A, B, and O.

What does it mean for a trait to have multiple alleles quizlet?

Terms in this set (5) Multiple Alleles. – When three or more alleles control a trait. Example. Blood Types in humans.

When more than one phenotype is influenced by the same gene then dominance?

“Dominance is not an autonomous feature of a gene in case more than one phenotype is influence by the same gene.” Dominance is not an autonomous feature of a gene in case more than one phenotype is influence by the same gene.

How are different combinations of genes affect phenotypes?

Different combinations of genes produce different phenotypes. However, it’s not just the batch of DNA you inherit that controls your phenotype. There are other factors as well. Today, we’re going to first look at the basics of how DNA controls your traits, then look at more complicated scenarios, like environmental influences.

How does the environment affect the phenotype of a person?

But, there are also environmental factors that can shape our phenotype. Let’s take a look at two examples. Although the sun can feel great on a cool day, too much sun is bad for your skin. The Sun’s ultraviolet (UV) radiation can change the structure of your DNA, creating mutations.

How are mutations related to the structure of DNA?

The combination of alleles you get from your parents creates your specific phenotype. Sometimes, certain genes act like a master switch, controlling other genes in a pathway, called epistasis. Mutations are changes to the structure of DNA and can cause diseases like cancer if enough mutations are accumulated.

Who is most likely to influence male phenotype?

Grandfathers were more likely to influence the phenotype of male grandchildren. Scientists think that epigenetic changes occurred during times when food was scarce and these changes were passed down to offspring. Many animal studies also back up this theory. Genotypes create different phenotypes in offspring.