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APA Unit 12 Lesson 3

AP A Unit 12 Lesson 3 Key Terms

QuestionAnswer
allele Alternative versions of a gene
dihybrid An organism that is heterozygous with respect to two genes of interest. All the offspring from a cross between parents doubly homozygous for different alleles are dihybrids. For example, parents of genotypes AABB and aabb
dominant allele An allele that is fully expressed in the phenotype of a heterozygote.
F1 generation The first filial generation
F2 generation the second filial generation
genotype The genetic makeup, or set of alleles, of an organism.
heterozygous Having two different alleles for a given gene.
homozygous Having two identical alleles for a given gene.
hybridization In genetics, the mating, or crossing, of two true-breeding varieties.
monohybrid An organism that is heterozygous with respect to a single gene of interest. All the offspring from a cross between parents homozygous for different alleles are monohybrids. For example, parents of genotypes AA and aa produce a monohybrid of genotype Aa.
P generation The true-breeding (homozygous) parent individuals from which F1 hybrid offspring are derived in studies of inheritance; P stands for “parental.”
phenotype The observable physical and physiological traits of an organism, which are determined by its genetic makeup.
Punnett square A diagram used in the study of inheritance to show the predicted genotypic results of random fertilization in genetic crosses between individuals of known genotype.
recessive allele An allele whose phenotypic effect is not observed in a heterozygote.
trait One of two or more detectable variants in a genetic character.
Created by: Jason Stanwood
 

 



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