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if an organism has a certain characteristic that is always passed on to its offspring, we say that this organism bred true with respect to that characteristic
Mendel's principal #2 of genetics
Each organism has two alleles that make up the genotype for a given trait.
Mendel's principal #3 of genetics
In sexual reproduction, each parent contributes ONLY ONE of its alleles to the offspring
Mendel's principal #4 of genetics
In each genotype, there is a dominant allele. If it exists in an organism, the phenotype is determined by that allele.
change in chromosome structure
a situation in which a chromosome loses or gains genes during meiosis
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