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one of two alternate forms of a gene that can have the same locus on homologous chromosomes and are responsible for alternative traits
threadlike structure within the nucleus containing the genetic information that is passed from one generation of cells to the next
A genetic disorder that occurs in people with two copies of a certain recessive allele; characterized by an excessive secretion of mucus and consequent vulnerability to infection; fatal if untreated.
the term for the rules that relate how a sequence of nitrogenous bases in nucleotides corresponds to a particular amino acid
the science of heredity and of the mechanisms by which traits are passed from parents to offspring
Unit character-traits controlled by factors (genes) which occur in pairs, Principle of Dominace, Principle of Segregation, and Principle Independent Assortment
a ratio that shows the varied outcomes that results from a genetic cross and is based on physical appearance alone
Absence of an enzyme, both recessive alleles must be inherited for the disorder to be displayed
a chart that shows all the possible combinations of alleles that can result from a genetic cross
An allele that will not determine the phenotype unless the genotype is homozygous in that allele
genetically engineered DNA made by recombining fragments of DNA from different organisms
a trait that is determined by a gene found on one of the sex chromosomes, such as the X chromosome or the Y chromosome in humans
sickle cell anemia
a genetic disorder in which erythroctyes take on an abnormal curved or "sickle" shape
recessive disorder that is of the nervous system and the child usually dies by the age of 4
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