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Unit 3
Genetics
18
Biology
10th Grade
05/04/2009

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Term
Genetics
Definition
The field of biology that fouces on how characteristics are transmitted from parents of offspring.
Term
Dominant
Definition
Referring to a factor that masks another factor for the same trait.
Term
Recessive
Definition
Referring to a factor that is masked by another factor for the same trait.
Term
Law of sergregation
Definition
The segregation, or seperation, of two factors for the same trait when a gamete forms.
Term
Law of independent assortment
Definition
the independent segergation of the factor that control differnent traits.
Term
Alle
Definition
An alternative form of a gene
Term
Punnett square
Definition
A way to show the possible outcome of a genetic cross.
Term
Phenotype
Definition
The expansion of the genotype of an organism.
Term
Genotype
Definition
The genetic makeup of an organism.
Term
Homozygous
Definition
The condition where both alleles of a pair are alike.
Term
Heterozygous
Definition
Thew condition where both alleles of a pair are different.
Term
Monohybird cross
Definition
A cross between individuals that involes one trait.
Term
Dihybrid cross
Definition
A cross between indiviuals that involes two traits.
Term
Incomplete dominance
Definition
A situation where two or more alleles influence the phenotype, which is in between that of the parents.
Term
Codominance
Definition
A situation where both alleles for a gene are expressed in a heterozygous individual.
Term
Sex chromosome
Definition
A chromosome that carries the genes that determine an individual's sex.
Term
X-linked trait
Definition
A trait whose alleles are located only on the X chromosome.
Term
Pedigree
Definition
A family history that shows individuals who display a particular trait and those who do not display that trait.
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