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Chapter 11
Vocabulary for chapter 11
14
Biology
9th Grade
11/02/2009

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Term
allele
Definition
an alternate form of a gene.
Term
chromosome
Definition
a discrete structure composed of DNA and protein found only in the nuclei
Term
dominant
Definition
a trait that covers or masks another allele
Term
filial
Definition
having or assuming the relation of a child or offspring
Term
genotype
Definition
the genetic makeup of an indiviual
Term
heterozygous
Definition
having different alleles for the same trait on a chromosome
Term
homozygous
Definition
having the same allele for the same trait on a chromsome
Term
homozygous dominant
Definition
having dominant alleles for the same trait on a chromsome
Term
homozygous recessive
Definition
having recessive alleles for the same trait on a chromsome
Term
hybrid
Definition
mixed offspring
Term
Mendilian traits
Definition
traits that are under the influence of one genetic locus
Term
phenotype
Definition
the observable or detectable physical characteristics of an organism.
Term
purebred
Definition
an organism who, when mated with another purebred with the same characteristics, will always produce purebreds.
Term
recessive
Definition
a trait that is not physically expressed in heterozygoytes
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