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15 Cards in this Set

  • Front
  • Back
Gene
length of DNA coding for a specific gene product
allele
variations of a gene
t/f
each person, and therefore the genetic population, can only have two alleles for a given gene
f
a genetic population can have multiple alleles while a person is limited to two alleles
pleiotrophism
one gene alters many unrelated phenotypes
polygenism
one trait influenced by many genes
penetrance
likelihood a person with a given genotype will express the expected phenotype
epistasis
expression of alleles for one gene is dependent on another gene.
incomplete dominance
heterozygous mix of dominant alleles
codominance
dominant alleles are both expressed but not blended
nondisjunction
failure of choromosomes to seperate in meiosis I (homologous) or sister chromatids in meiosis II
Principles of Mendelian Genetics
1. principle of segregation
2. law of independent assortment
Principle of segregation
two alleles of an individual are seperated and possed on to the next generation singly
Law of Independent Assortment
alleles of one gene will seperate into gametes independently of the other alleles
Linkage
failure to follow the law of independent assortment
population
members of a species that mate and reproduce with eachother.