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23 Cards in this Set
- Front
- Back
Chromosomal theory of inheritance
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mendelain genes have specific loci on chromosomes and it is chromosomes that undergo segregation and independent assortment
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wild type
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the most common phenotype for a character the phenotype most common in a natural population
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mutant phenotype
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traits that are alternative to the wild type
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sex linked genes
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genes located on the sex chromosomes
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linked genes
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genes located on the same chromosome which tend to be inherited together in genetc crosses because the chromosome is passed along as a unit
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genetic recombination
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offspring with new combinations of traits inherited by two parents q
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recombinants
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when offspring have different combinations of phenotypes than their parents
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linkage map
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a genetc map based on the combination frequencies
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cytological map
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maps that locate genes with a respect to chromosomal features
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Duchenne muscular dystrophy
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affects one in 3500 males in us rarely live past 20's progressice weekening of the muscles and loss of coordination
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hemophilia
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a sex linked reccesive trait of a certain protein required for blood clotting
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barr body
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the inactive x in each cell of a female condenses into a compact ovject called the bb which is in the nucleur envelope
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Nondissjunction
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a misshap
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poly ploidy
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when someone has more than a full set of chromosomes
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Duplication
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when a fragment joins to a homologous chromosome
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inversion
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when it reattaches to a chromosome
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aneuploidy
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if either of the abarrent gamets units with a normal one at fertilization the offspring all have an abnormal chromosome number
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trisomic
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if the chromosome is present in triplicate in triplicate in the fertilized egg (2nt chromosomes)
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monosomic
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if a chromosome is missing (2n-1 chromosome0 then the aneuploid cell is monosomic
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deletion
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occurs when a cromosome fragemnt lacking a centromere is lost during cell division
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Translocation
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a 4th possive result of of chromosomal breakage is for the fragment to join a non homologous chromosome
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down syndrome
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aneuploidy condition affecting appearence in 700 kids in the us extra chromosome 21
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fragile x syndrom
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1/2500 females retardation part of x chromosome hangs on by a thread
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