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26 Cards in this Set

  • Front
  • Back
a theory that Mendelian genes have a specific loci on chromosomes, and that chromosomes undergo segregation and independent assortment
chromosome theory of inheritance
the normal phenotype of a character
wild type
genes located on a sex chromosome
sex-linked genes
genes located on the same chromosome that are usually inherited together
linked genes
the production of offspring with new combinations of traits inherited from two parents
genetic recombination
offspring with a phenotype that matches one of the parental phenotypes
parental types
an offspring whose phenotype differs from that of the parents
an ordered list of genetic loci along a chromosome
genetic map
a genetic map based on recombination frequencies
linkage map
a measurement of the distance between genes
map unit
charts of chromosomes that locate genes with respect to chromosomal features
cytological map
a sex-linked disorder characterized by a progressive weakening of the muscles and loss of coordination; victims usually don't live past their early 20s
Duchenne muscular dystrophy
a sex-linked recessive trait defined by the absence of one or more of the proteins required for blood clotting
a condensed, inactive X chromosome that lies along the nuclear envelope of a female
Barr body
this occurs when members of a pair of homologous chromosomes do not move apart properly during meiosis I or sister chromatids fail to separate during meiosis II
an abnormal chromosome number
a cell total of 2n + 1
a cell total of 2n - 1
a general term for organisms that have more than two complete chromosome sets
this occurs when a chromosomal fragment lacking a centromete is lost during cell division
this occurs when a fragment may become attached as an extra segment to a sister chromatid
this occurs when a chromosomal fragment reattaches to the original chromosome but in the reverse orientation
this occurs when a chromosomal fragment joins a nonhomologous chromosome
a disease that is usually the result of an etra chromosome 21, with each cell having 47 chromosomes
Down syndrome
a process in which a gene on one chromosome is somehow silenced, while its allele on the homologous chromosome is left free to be expressed
genomic imprinting
a disorder named for the physical appearance of an abnormal X chromosome; causes mental retardation
fragile X syndrome