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BMMS Life Sci Chpt 5


heredity The passing of physical characteristics from parents to offspring.
trait Each different form of a characteristic.
genetics The scientific study of heredity.
fertilization A new organism begins to form when an egg and sperm join in this process.
purebred The offspring of many generations that have the same traits.
gene The factors that control a trait.
alleles The different forms of a gene.
dominant allele An allele whose trait always shows up in the organism when the allele is present.
recessive allele Hidden whenever the dominant allele is present.
hybrid An organism that has two different alleles for a trait.
probability A number that describes how likely it is that a certain event will occur.
Punnett square A chart that shows all the possible combinations of alleles that can result from a genetic cross.
phenotype An organism's physical appearance, or visible traits.
genotype An organism's genetic makeup, or allele combination.
homozygous An organism that has two identical alleles for a trait.
heterozygous An organism that has two different alleles for a trait.
codominance The alleles are neither dominant nor recessive; therefore, both alleles are expressed in the offspring.
Created by: tsheldon