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Bio Essential Vocab Chapter 14
Essential vocab for Chapter 14
21
Biology
Undergraduate 1
01/22/2011

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Term
character
Definition
An observable heritable feature
Term
trait
Definition
Any detectable variant in a genetic character
Term
hybridization
Definition
In genetics, the mating, or crossing, of two true-breeding varieties.
Term
true-breeding
Definition
Referring to plants that produce offspring of the same variety when they self-pollinate
Term
P generation
Definition
The parent individuals from which offspring are derived in studies of inheritance; P stands for “parental.”
Term
F1 generation
Definition
The first filial, or hybrid, offspring in a series of genetic crosses.
Term
F2 generation
Definition
Offspring resulting from interbreeding of the hybrid F1 generation.
Term
selfpollination
Definition
the transfer of pollen from the anthers to the stigma of the same flower or of another flower on the same plant
Term
dominant allele
Definition
An allele that is fully expressed in the phenotype of a heterozygote.
Term
recessive allele
Definition
An allele whose phenotypic effect is not observed in a heterozygote.
Term
gene
Definition
A discrete unit of hereditary information consisting of a specific nucleotide sequence in DNA (or RNA, in some viruses)
Term
allele
Definition
Any of the alternative versions of a gene that produce distinguishable phenotypic effects.
Term
Punnet square
Definition
A diagram used in the study of inheritance to show the predicted results of random fertilization in genetic crosses.
Term
homozygous
Definition
Having two identical alleles for a given gene.
Term
heterozygous
Definition
Having two different alleles for a given gene.
Term
phenotype,
Definition
The physical and physiological traits of an organism, which are determined by its genetic makeup.
Term
genotype
Definition
The genetic makeup, or set of alleles, of an organism
Term
testcross
Definition
Breeding an organism of unknown genotype with a homozygous recessive individual to determine the unknown genotype. The ratio of phenotypes in the offspring reveals the unknown genotype.
Term
monohybrid
Definition
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.
Term
dihybrid
Definition
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 produce a dihybrid of genotype AaBb.
Term
pedigree
Definition
A diagram of a family tree showing the occurrence of heritable characters in parents and offspring over multiple generation
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