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Genetics
Genetics
20
Biology
9th Grade
12/20/2010

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Term
Gregor Mendel
Definition
-Austrian Monk
-did pea plant experiments that made the foundation for genetics
Term
genetics
Definition
scientific study of heredity
Term
gene
Definition
sequnce of DNA that codes for a protien and determines a trait
Term
allele
Definition
one of number of different forms of genes.
Term
trait
Definition
specifc characteristic that is different from one person to another
Term
genotype
Definition
genetic makeup of an organism
Term
phenotype
Definition
phyical characteristic of an orgnism
Term
homozygous
Definition
organism that has the same allele for one trait
Term
heterozgous
Definition
oranism that has two different allels for the same trait
Term
punett square
Definition
a diagram
-shows the genetic combination that might occur from a genetic cross
Term
segregation
Definition
seperation of alleles during gamete formation
Term
independent assortment
Definition
ind. segreation of genes during the formation of gametes
Term
incomplete dominace
Definition
when one allele is not compeltly dominant over another
Term
codominace
Definition
sitation in which both alleles of a gene contribute to the phenotype of an organism
Term
multiple alleles
Definition
thee or more alleles of the same trait
Term
polygenic traits
Definition
trait controlled by two genes
Term
gene map
Definition
diagram showing the relative locations of each known gene on a particular chromosome
Term
sex chromosome
Definition
chrom. that determines the sex of an organism
Term
karyotype
Definition
picture of chromosomes
-taken during metaphase in mitosis
Term
pedigree
Definition
a diagram that shows inheritance of genes in a family
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