A type of cell division in which the daughter cell has half the number of chromosomes of the parent cell
A type of cell division in which the daughter cell is genetically identical to the parent cell
The term for separate sexes. These types of organisms have male and females as separate beings.
Define synchronous hermaphroditism
the condition in which both sexes are functional at the same time
Define asynchronous hermaphroditism
the condition in which both sexes are not functional at the same time
A type of asynchronous hermaphroditism in which the organism functions first as a female and then as a male
A type of asynchronous hermaphroditism in which the organism functions first as a male and then as a female
What is the benefit of asynchronous hermaphroditism?
Prevents self-fertilization which leads to greater genetic diversity of the population
the process by which some organisms produce their food through chemical mechanisms that do not require light
A relationship in which members of different species live in close contact with each other and at least one of them benefits from the relationship
a type of symbiosis in which one of the organisms benefits and the other is not affected
Give an example of commensalism
- tiny animals benefit from living among the gills of crayfish (transportation, protection, food scraps)
- cattle birds benefit from the natural movement of cattle that stirs up insects
- little worms benefit from living in the ureters of frogs and toads (passing nutrients, protection)
Give an example of mutualism
clown fish live among sea anemones. Fish are protected by its tentacles, the sea anemone receives "food scraps"
a type of symbiosis in which one of the organisms is benefitted and the other is harmed
Describe the parasite life cycle
larva > immature form > adult form.
Each stage may require a different host species or group of related hosts.
Define intermediate host
the host that the larval form of parasites live in, allows for development of immature form
A type of symbiosis in which one of the organisms is benefitted and the other is eventually killed
Give an example of parasitoidism
Tiny wasps are parasitioids that lay their eggs on other insects so that their larvae can feed
the concentration of nervous and sensory tissues at the anterior end of the animal
Define biradial symmetry
components are arranged in an oval configuration around the oral-aboral axis
Describe the hydrostatic skeleton
An skeleton based on water which is noncompressible. Muscles can exert force to cause movement of solution which results in locomotion.