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26.8: H

Created by: CK-12
habitat
physical environment in which a species lives and to which it has become adapted
habitat loss
destruction or disruption of Earth’s natural habitats, most often due to human actions such as agriculture, forestry, mining, and urbanization
hair follicle
structure in the dermis of skin where a hair originates
haploid
having only one chromosome of each type
Hardy-Weinberg theorem
founding principle of population genetics that proves allele and genotype frequencies do not change in a population that meets the conditions of no mutation, no migration, large population size, random mating, and no natural selection
heart
muscular organ in the chest that that pumps blood through blood vessels when it contracts
heart attack
blockage of blood flow to heart muscle tissues that may result in the death of cardiac muscle fibers
hepatitis B
inflammation of the liver caused by infection with hepatitis B virus, which is often transmitted through sexual contact
herbivore
consumer that eats producers such as plants or algae
heterotroph
organism that gets food by consuming other organisms
heterozygote
organism that inherits two different alleles for a given gene
homeobox gene
gene that codes of regulatory proteins that control gene expression during development
homeostasis
process of maintaining a stable environment inside a cell or an entire organism
homologous chromosomes
pair of chromosomes that have the same size and shape and contain the same genes
homologous structure
structure that is similar in related organisms because it was inherited from a common ancestor
homozygote
organism that inherits two alleles of the same type for a given gene
host
species that is harmed in a parasitic relationship
human genome
all of the DNA of the human species
Human Genome Project
international science project that sequenced all 3 billion base pairs of the human genome
human immunodeficiency virus (HIV)
virus transmitted through body fluids that infects and destroys helper T cells and eventually causes acquired immunodeficiency syndrome (AIDS)
human papilloma virus (HPV)
sexually transmitted virus that causes genital warts and cervical cancer
humoral immune response
type of immune response in which B cells produce antibodies against antigens in blood and lymph
hybrid
offspring that results from a cross between two different types of parents
hydrogen bond
type of chemical bond that forms between molecules: found between water molecules
hydrostatic skeleton
type of internal support in an animal body that results from the pressure of fluid within the body cavity known as the coelom
hypertension
high blood pressure
hyphae (singular, hypha)
thread-like filaments that make up the body of a fungus and consist of one or more cells surrounded by a tubular cell wall
hypothalamus
part of the brain that secretes hormones
hypothesis
possible answer to a scientific question; must be falsifiable

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Feb 23, 2012

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Nov 25, 2014
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CK.SCI.ENG.SE.1.Biology.26.8

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