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23 Cards in this Set

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the sex cells from the mother and fther that form a new cell at conception
gametes
the new cell formed by the process of fertilization
zygote
the basic unit of genetic information
genes
rod-shaped portions of DNA that are organized in 23 pairs
chromosomes
the underlying combination of genetic material present (not visible) in an organism
genotype
an observable trait
phenotype
inheritance in which a combination of multiple gene pairs is responsible for the production of a particular trait
polygenic inheritance
genes that are considered recessive and located only on the X chromosome
x-linked genes
the study of the effects of heredity on behavior
behavioral genetics
a disorder produced by the presence of an extra chromosome on the 21st pair
down syndrome
a blood disorder that gets its name from the shape of the red blood cells in those who have it
sickle-cell anemia
a disease that produces blindness and muscle degeneration prior to death; there is no treatment
tay-sachs disease
a disorder resulting from the presence of an extra X chromosome that produces underdeveloped genitals, extreme height, and enlarged breasts
klinefelter's syndrome
patterns of arousal and emotionality that represent consistent and enduring characteristics in an individual
temperament
the process by which a sperm and an ovum join to form a single new cell
fertilization
the first, and shortest stage, of the prenatal period, which takes place during the first 2 weeks following conception
germinal stage
a conduit between the mother and fetus, providing nourishment and oxygen via the umbilical cord
placenta
the period from 2 to 8 weeks following fertilization during which significant growth occurs in the major organs and body systems
embryonic stage
the stages that begins at about 8 weeks after conception and continues until birth
fetal stage
a developing child, from 8 weeks after conception until birth
fetus
the inability to conceive after 12-18 months of trying to become pregnant
infertility
a factor that produces a birth defect
teratogen
a disorder caused by the pregnant mother consuming substantial amounts of alcohol during pregnancy
fetal alcohol syndrome