An organism’s phenotype results from two basic factors:
the expression of an organism’s genetic code, or its genotype, and the influence of environmental factors
. Both factors may interact, further affecting phenotype.
What are the 2 main things that determine an organism’s phenotypic traits?
To summarize, two things determine the traits an organism has:
its genotype and the dominance or recessiveness of the alleles it has
. Some traits, like flower color in peas, are controlled by a single gene, but ultimately many if not most traits in an organism are controlled by more than one gene.
What are the two types of phenotypic variation?
This type of non-plastic phenotypic variation can be subdivided into: (1) genetic differentiation, also termed specialization, genetically based differences between individuals that do not vary with environment; and
(2) fixed ontogenetic variation
, developmental patterns that are constant across environments. …
What are the three main sources of phenotypic variation?
For a given population, there are three sources of variation:
mutation, recombination, and immigration of genes
. However, recombination by itself does not produce variation unless alleles are segregating already at different loci; otherwise there is nothing to recombine.
What is the role of phenotypic variation?
Phenotypic variation is at the core of natural selection: the
diversity of phenotypes allows some members of a population to have beneficial traits and others to have less beneficial traits
. However, not all phenotypic variations have an impact on survival and reproduction. Let’s take our hair color example from above.
What are the two types of variation?
If you consider almost any characteristic, you will find differences between various people (or other animals or plants) in a population. There are two forms of variation:
continuous and discontinuous variation
.
What are examples of phenotype?
Examples of phenotypes include
height, wing length, and hair color
. Phenotypes also include observable characteristics that can be measured in the laboratory, such as levels of hormones or blood cells.
What are the traits of a phenotype?
A phenotype is
an individual’s observable traits, such as height, eye color, and blood type
. The genetic contribution to the phenotype is called the genotype. Some traits are largely determined by the genotype, while other traits are largely determined by environmental factors.
How do you express your phenotype?
Phenotype is determined by
an individual’s genotype and expressed genes, random genetic variation, and environmental influences
. Examples of an organism’s phenotype include traits such as color, height, size, shape, and behavior.
What are the 5 sources of genetic variation?
Genetic variation can be caused by mutation (which can create entirely new alleles in a population),
random mating, random fertilization, and recombination between homologous chromosomes during meiosis
(which reshuffles alleles within an organism’s offspring).
What are the two main sources of genetic variation?
Natural selection acts upon two major sources of genetic variation:
mutations and recombination of genes through sexual reproduction
.
What are the types of phenotypic variation?
- Genetic Divergence.
- Phenotype.
- Genomics.
- Genotype.
- Chromosomes.
- Heritability.
- Quantitative Trait Loci.
- Mutation.
What causes a phenotype?
An organism’s phenotype results from two basic factors:
the expression of an organism’s genetic code, or its genotype
, and the influence of environmental factors. Both factors may interact, further affecting phenotype.
What is the difference between genotypic and phenotypic variation?
A key difference between phenotype and genotype is that, whilst genotype is inherited from an organism’s parents,
the phenotype is not
. Whilst a phenotype is influenced the genotype, genotype does not equal phenotype. The phenotype is influenced by the genotype and factors including: Epigenetic modifications.
What causes variation within a population?
Genetic variation can be caused by
mutation
(which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism’s offspring).
What is the formula of variation?
The formula
y=kxn y = k x n
is used for direct variation. The value k is a nonzero constant greater than zero and is called the constant of variation.
