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26.9: I

Difficulty Level: At Grade Created by: CK-12
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movement of individuals into a population
immune response
specific defense against a particular pathogen
immune system
body system that consists of skin, mucous, membranes, and other tissues and organs that defends the body from pathogens and cancer
ability to resist a pathogen due to memory lymphocytes or antibodies to the antigens the pathogen carries
deliberate exposure of a person to a pathogen in order to provoke an immune response and the formation of memory cells specific to that pathogen
inability of the immune system to fight off pathogens that a normal immune system would be able to resist
process in which a blastocyst embeds in the endometrium lining the uterus
incomplete digestive system
digestive system that consists of a digestive cavity and a single opening that serves as both mouth and anus
incomplete dominance
relationship between the alleles for a gene in which one allele is only partly dominant to the other allele so an intermediate phenotype results
period of bird reproduction when one or both parents sit on, or brood, the eggs in order to keep them warm until they hatch
independent assortment
independent segregation of chromosomes to gametes during meiosis
independent variable
variable in a scientific experiment that is manipulated by the researcher to investigate its effect on another variable called the dependent variable
first year of life after birth in humans
inflammatory response
nonspecific response the body first makes to tissue damage or infection
inheritance of acquired characteristics
mistaken idea of Jean Baptiste Lamarck that evolution occurs through the inheritance of traits that an organism develops in its own life time
innate behavior
behavior closely controlled by genes that occurs naturally, without learning or practice, in all members of a species whenever they are exposed to a certain stimulus; also called instinctive behavior
ability of an animal to perform a behavior the first time it is exposed to the proper stimulus
integumentary system
human body system that includes the skin, nails, and hair
type of neuron that carries nerve impulses back and forth between sensory and motor neurons
stage of the eukaryotic cell cycle when the cell grows, synthesizes DNA, and prepares to divide
interspecific competition
relationship between organisms of different species that strive for the same resources in the same place
intertidal zone
in marine biomes, the narrow strip along the coastline that is covered by water at high tide and exposed to air at low tide
intraspecific competition
relationship between organisms of the same species that strive for the same resources in the same place
animal that lacks a vertebral column, or backbone

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Date Created:
Feb 23, 2012
Last Modified:
Sep 13, 2016
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