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AP Biology Chapter 11 Flashcards

Mader Biology 11 ed. chapter 11

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5571483591Monohybrid CrossCross between parents that differ in only one trait.0
5571483592LocusThe physical condition of a trait or gene on a chromosome.1
5571483593AllelesAlternative form of a gene; occur at the same locus on homologous chromosomes.2
5571483594Dominant AlleleAllele that exerts it's phenotypic effect in the heterozygote; it masks the expression of the recessive allele.3
5571483595Recessive AlleleAllele that exerts it's phenotypic effect only in the homozygote; its expression is masked by the dominant allele.4
5571483596HomozygousPossessing two identical alleles for a particular trait.5
5571483597HeterozygousPossessing unlike alleles for a particular trait.6
5571483598GenotypeGenes of an organism for a particular trait or traits; often designated by letters.7
5571483599PhenotypeVisible expression of a genotype.8
5571483600Dihybrid CrossCross between parents that differ in two traits.9
5571483601Punnett SquareVisual representation used to calculate the expected results of simple genetic crosses.10
5571483602TestcrossCross between an individual with a dominant phenotype and an individual with a recessive phenotype to determine whether the dominant individual is homozygous or heterozygous.11
5571483603AutosomeChromosome pairs that are the same between the sexes; in humans, all but the X and Y chromosomes.12
5571483604Law of Independent AssortmentMendelian principle that explains how combinations of traits appear in gametes.13
5571483605CarriersHeterozygous individual that has no apparent abnormalities but can pass on an allele for a recessively inherited genetic disorder.14
5571483606Multiple AllelesInheritance pattern in which there are more than two alleles for a particular trait; each individual has only two of all possible traits.15
5571483607CodominanceInheritance pattern in which both alleles of each gene are equally expressed in a heterozygote.16
5571483608Incomplete DominanceInheritance pattern in which an offspring has an intermediate phenotype, as when a red-flowered plant and a white-flowered plant produce pink-flowed offspring.17
5571483609Incomplete PenetranceDominant alleles that are either not always or partially expressed.18
5571483610PleiotropyInheritance pattern in which one gene affects many phenotypic characteristics of the individual.19
5571483611Polygenic InheritancePattern of inheritance in which a trait is controlled by several allelic pairs.20
5571483612X LinkedAllele that is located on an X chromosome.21
5571483613HemizygousProcessing only one allele for a gene in a diploid organism; males are this for genes on the X chromosome22

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