Key Terms in Genes and Inheritance

additive effects,

allele,

carrier,

codominance,

cross,

dihybrid,

dihybrid cross,

dominant,

genotype,

heredity,

heterozygous,

homozygous,

incomplete dominance,

linked gene,

Mendel’s law of independent assortment,

Mendel’s law of segregation,

multiple allelism,

pedigree,

phenotype,

pleiotropy,

polygenic,

Punnett square,

recessive,

sex-linked trait,

single-gene trait,

test-cross,

true-breeding,

ABOUT THE CHAPTER OPENING PHOTO

Identical twins inherit the same genetic material. Shown here are sets of twins posing for a group picture at a gathering of more than five hundred sets of twins in Germany.

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