Crossing-over is a genetic phenomenon that occurs in meiosis, specifically, Prophase I. It is when chromosomal segment (genes) are exchanged between non-sister chromatids of homologous chromosomes. Crossing-over occurs only to genes that are UNLINKED i.e. genes located on different chromosomes or far apart on the same chromosome.
This unlinked genes are said to have the highest RECOMBINATION FREQUENCY. Crossing-over allows genes on the same chromosome but far apart from each other, assort independently, which allows alleles to be recombined on the same chromosome. This phenomenon does not occur to genes that are close on the same chromosome as they will be inherited together as a unit.
In this case, G and K are the farthest apart, hence, they will have the highest RECOMBINATION FREQUENCY i.e. the likelihood for homologous crossing-over to take place during meiosis.
Coelomates: Animals that have a body that incorporates voids are known as coelomates, they have a total body structure, and their bodies are ensured by coelom which goes about as a body skeleton and spares all the interior organs from outer pressure. The coelom is shaped at the stage known as gastrula, after various procedures which incorporate different capacities the mesoderm is isolated into two sections and coelom begins existing between them. The primary layer is near the body itself called endoderm while the other layer is at the external side known as ectoderm.
Pseudocoelomates: Animals that don't have an appropriate body hole are known as pseudocoelomates. This is a direct result of the explanation that they have pseudo coelom which is available between the ectoderm and endoderm and lies outside the mesoderm. They are likewise dissipated and present at more than one spots, thusly, have a structure which doesn't appear to be like different species. In spite of the fact that it is a body cavity and capacities appropriately but since of their temperament, the liquid isn't line appropriately however fills the assemblage of creatures, in light of this the organs are put near one another in a dispersed way and thusly doesn't permit the body to shape a legitimate skeleton.
