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Ch 11- Genetics
Genetics
26
Biology
9th Grade
01/09/2007

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Term
Genetics
Definition
The scientific study of heredity
Term
true-breeding
Definition
if allowed to self-pollinate, they would produce offspring identical to themselves
Term
trait
Definition
a specific characteristic such as seed color or plant height that varies from one individual to another
Term
hybrid
Definition
the offspring of crosses between parents with different traits
Term
gene
Definition
chemical factor that determines traits
Term
allele
Definition
different forms of a gene
Term
segregation
Definition
separation of alleles
Term
gametes
Definition
sex cells
Term
probability
Definition
the likelihood that an even will occur
Term
Punnett Square
Definition
a diagram that can determine the gene combinations that might result from a genetic cross
Term
homozygous
Definition
organisms that have 2 identical alleles for a particular trait- TT or tt
Term
heterozygous
Definition
organisms that have 2 different alleles for the same trait
Term
phenotype
Definition
physical characteristics
Term
genotype
Definition
genetic makeup
Term
independent assortment
Definition
independent segregation of genes during the formations of gametes
Term
incomplete dominance
Definition
cases in which one allele is not completely dominant over another
Term
codominance
Definition
both alleles contribute to the phenotype of the organism
Term
multiple alleles
Definition
genes with more than 2 alleles
Term
polygenic traits
Definition
traits controlled by 2 or more genes
Term
homolgous
Definition
chromosomes that each have a corresponding chromosome from the opposite sex parent
Term
diploid
Definition
a cell that contains both sets of homologous chromosomes
Term
haploid
Definition
a cell that contains only a single set of chromosomes & therefore only a single set of genes
Term
meiosis
Definition
process of reduction division in which the # of chromosomes per cell is cut in half through the separation of homologous chromosomes in a diploid cell
Term
tetrad
Definition
structure containing 4 chromatids
Term
crossing-over
Definition
as homologous chromosomes pair up & form tetrads in meiosis I, they may exchange portions of their chromatids in this process
Term
gene map
Definition
diagram showing the relative locations of each known gene on a particular chromosome
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