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Ch. 11
Mendelian Patterns of Inheritance
22
Biology
Undergraduate 1
06/27/2012

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Term
autosome
Definition
Any chromosome other than the sex-determining pair.
Term
carrier
Definition
Heterozygous individual who has no apparent abnormality but can pass on an allele for a recessively inherited genetic disorder.
Term
codominance
Definition
Inheritance pattern in which both alleles of a gene are equally expressed in a heterozygote.
Term
dihybrid cross
Definition
Cross between parents that differ in two traits.
Term
dominant allele
Definition
Allele that exerts its phenotypic effect in the heterozygote; it masks the expression of the recessive allele.
Term
family pedigree
Definition
Chart of genetic relationship of family individuals through the generations.
Term
gene locus
Definition
Specific location of a particular gene on a chromosomes.
Term
genotype
Definition
Genes of an organism for a particular trait or traits; often designated by letters—for example, BB or Aa.
Term
hemizygous
Definition
Possessing only one allele for a gene in a diploid organism; males are hemizygous for genes on the X chromosome.
Term
heterozygous
Definition
Possessing unlike alleles for a particular trait.
Term
homozygous
Definition
Possessing two identical alleles for a particular trait.
Term
incomplete dominance
Definition
Inheritance pattern in which the offspring has an intermediate phenotype, as when a red-flowered plant and a white-flowered plant produce pink flowered offspring.
Term
incomplete penetrance
Definition
Dominant alleles that are not always expressed, often for unknown reasons.
Term
monohybrid cross
Definition
Cross between parents that differ in only one trait.
Term
multifactorial trait
Definition
Trait controlled by polygenes subject to environmental influences; each dominant allele contributes to the phenotype in an additive and like manner.
Term
multiple alleles
Definition
Inheritance pattern in which there are more than two alleles for a particular trait; each individual has only two of all possible alleles.
Term
phenotype
Definition
Visible expression of a genotype—e.g., brown eyes or attached earlobes.
Term
polygenic inheritance
Definition
Pattern of inheritance in which a trait is controlled by several allelic pairs; each dominant allele contributes to the phenotype in an additive and like manner.
Term
punnett square
Definition
Grid used to calculate the expected results of simple genetic crosses.
Term
recessive allele
Definition
Allele that exerts its phenotypic effect only in the homozygote; its expression is masked by a dominant allele.
Term
testcross
Definition
Cross between an individual with the dominant phenotype and an individual with the recessive phenotype. The resulting phenotypic ratio indicates whether the dominant phenotype is homozygous or heterozygous.
Term
X-linked
Definition
Allele that is located on an X chromosome but may control a trait that has nothing to do with the sexual characteristics of an animal.
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