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10 Cards in this Set

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The percentage of variation within a given population that is due to heredity.
heritability
The single cell formed at conception from the union of the egg cell and sperm cell.
zygote
A long, threadlike structure composed of twisted parallel strands of DNA; found in the cell nucleus.
chromosome
The double-stranded molecule the encodes genetic instructions; the chemical basis of heredity.
deoxyribonucleic acid
(DNA)
A unit of DNA on a chromosome that encodes instructions for making a particular protein molecule; the basic unit of heredity.
gene
The genetic makeup of an individual organism.
genotype
The scientific description of the complete set of DNA in the human organism, including gene locations.
human genome
One of the different forms of a particular gene.
allele
The observable traits of characteristics of an organism as determined by the interaction of genetics and environmental factors.
phenotype
Chromosomes, designated as X or Y, that determine biological sex; the 23rd pair of chromosomes in humans.
sex chromosomes