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16 Cards in this Set

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  • Back
trait
a physical characteristic of a living thing that can be passed on to its offspring
heredity
the passing of traits from parents to offspring
genetics
the scientific study of heredity
purebred
an organism that always produces offspring with the same trait as the parent
gene
a segment of DNA that codes for a specific trait
allele
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
an allele that is "covered up" or masked when a dominant allele is present
hybrid
an organism that has two different alleles for a trait
probability
the likelihood that a particular event will happen
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 trait
genotype
an organism's genetic make up, or allele combination
homozygous
having the same, two identical alleles for a trait. PUREBRED Example: TT or tt
heterozygous
having two different alleles for a trait. HYBRID Example: Tt or Ss
codominance
a condition in which neither of two alleles of a gene is dominant or recessive. offspring doesn't look like either parent