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Chapter 3 Genetics

Vocabulary for Prentice Hall Life Science Explorer

traitphysical characteristics
hereditythe passing of traits from parents to offspring
purebredone that always produces offspring with the same form of a trait as the parent
genefactors that control traits
allelesdifferent forms of a gene
recessive allelea trait that is masked or covered up whenever a dominant allele is present
dominanta trait that always shows up in the organism when the allele is present
hybridhave two different alleles for the same trait
probabilitythe likelihood that a particular event will occur
Punnett Squarea chart that shows all the possible outcomes of a genetic cross
genotypegenetic make or allele make up
phenotypean organisms physical appearance
homozygoustwo identical alleles for a trait
heterozygoustwo different allelles for the same trait
codominancethe alleles are neither dominant nor recessive.
spermmale sex cell
eggfemale sex cell
Chromosome theory of Inheritancegenes are carried from parents to their offspring on chromosomes
meiosisthe process by which the number of chromosomes is reduced by half to form sex cells
Protein Synthesisthe cell uses information from a gene on a chromosomes to produce a specific protien

Collaborative Educator
William Byrd Middle School
Vinton, VA

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