Search results
Results from the WOW.Com Content Network
Homologous sequences are paralogous if they were created by a duplication event within the genome. For gene duplication events, if a gene in an organism is duplicated, the two copies are paralogous. They can shape the structure of whole genomes and thus explain genome evolution to a large extent.
The alleles on the homologous chromosomes may be different, resulting in different phenotypes of the same genes. This mixing of maternal and paternal traits is enhanced by crossing over during meiosis, wherein lengths of chromosomal arms and the DNA they contain within a homologous chromosome pair are exchanged with one another. [3]
Homologous behaviors, behaviors typical of species that share a common ancestor that was characterized by that behavior OR behaviors in an individual that share common origins in development; Homology (sociology), a structural resonance between the different elements making up a socio-cultural whole
Based on the definition of homology specified above this terminology is incorrect since sequence similarity is the observation, homology is the conclusion. [3] Sequences are either homologous or not. [3] This involves that the term "percent homology" is a misnomer. [4]
Homologous behaviors can theoretically be of at least two different varieties. [1] As with homologous anatomical characteristics , behaviors present in different species can be considered homologous if they are likely present in those species because the behaviors were present in a common ancestor of the two species.
In other words, the definition is restricted to protein-coding genes. Here is an example from a recent article in American Scientist. ... to truly assess the potential significance of de novo genes, we relied on a strict definition of the word "gene" with which nearly every expert can agree.
Functionally similar features that have arisen through convergent evolution are analogous, whereas homologous structures or traits have a common origin but can have dissimilar functions. Bird, bat, and pterosaur wings are analogous structures, but their forelimbs are homologous, sharing an ancestral state despite serving different functions.
A cell is said to be homozygous for a particular gene when identical alleles of the gene are present on both homologous chromosomes. [2] An individual that is homozygous-dominant for a particular trait carries two copies of the allele that codes for the dominant trait. This allele, often called the "dominant allele", is normally represented by ...