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30 Cards in this Set
- Front
- Back
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1* sex determination
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Sry
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chromomere
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localized condensation
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chromatid
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backbone is a single DNA molecule
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centimorgan
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1% recombination
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homogametic
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only 1 chromosomal type of gamete
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addition rule
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true only if events cannot occur at same time
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centromere division
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occurs at beginning of anaphase in mitosis
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recombinationj frequency = 20%
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map distance > 20
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pleiotropy
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production of superficially unrelated effects by a single allele
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bivalent
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formed in zygotene
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germ cells
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undergo meiosis
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DNA replication
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absent in interphase between meiosis I and II
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diplotene
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chiasmata become visible
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5-bromouracil
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analog of thymine
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PD= NPD
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genes on nonhomologous chromosomes
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expressivity
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extent to which phenotype altered in affected individuals
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polar bodies
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produced by asymmetric cell division
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sex chromosomes
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present in different numbers in males and females
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chromosome
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composed of 2 long DNA molecules at prophase
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P value from statistical test
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probability of obtaining at least as bad a fit as data observed, assuming model correct
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3:1
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phenotypic ratio in test cross of AaBbm ,where recessive alleles cause same phenotype
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karyotype
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chromosome sets as seen at end of prophase
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propositus
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brought pedigree to attention of geneticists
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pure breeding
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homozygous
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linkage
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PD >>>NPD
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coupling
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alleles in cis
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epistasis
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masked gene encodes enzyme that acts downstream
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0-50%
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range of observed recombination frequencies
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heterogametic
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gender whose gametes determine sex of zygotes
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sister chromatid adhesion
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lost at start of anaphase I
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