1. an organism with two different genes for a paricular trait; a heterozygous organism; 2. an organism that is crossbred between two different species of animals or plants; hybrids w/in single kind- fertile, w/in diff. kinds- infertile
hybrid
the type of inheritance in which genes are neither dominant nor recessive, resulting in a mixing or blending of traits because both genes are expressed
incomplete dominance
a set of traits whose genes are located on the same chromosome and not inherited independently
linkage groups
a type of cell division in which the number of chromosomes in the daughter cells is reproduced to half the number in the parent cell, making sexual reproduction possible; also called reduction division
meiosis
a genetic trait that does not show up in an organism unless the organism is homozygous for that trait; opposite of dominant trait
recessive trait
see meiosis
reduction division
the chromosomes responsible for the development of male or female characteristics; the X and Y chromosomes
sex chromosomes
a genetic disease, affecting red blood cells, that affects some people of African ancestry; caused by a genetic defect in hemoglobin molecules that causes the certain conditions, leading to circulatory problems
sickle-cell anemia
a fertilized ovum; the new single cell formed by the union of sperm and egg
zygote
in modern genetics, different forms of a gene for a particular trait (such as seed color)
allel
an individual who possesses an unexpressed recessive gene for a genetic disease
carrier
the process a cell changes from a generalized form to become a specialized cell such as a skin cell, nerve cell, muscle, cell, etc.(blank)
differentiation
an organism whose genes are hybrid for two traits
dihybrid
a genetic trait which shows up in an organism even when a different gene for the same trait is also present
dominant trait
a social movement originated by some of Darwin's followers which advocates selective breeding and forced sterilization as a means of improving the human species to produce a "master race"
eugenics
the extent to which a certain gene exists in a population of organisms
gene frequency
the specific study of heredity
genetics
the passing on of genetic characteristics from the parent to the offspring by means of genes in the chromosomes of the cells
heredity
having two like genes for a particular trait; a purebred
homozygous
describing an organism with two unlike genes for a paricular trait
