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Cards In This Set
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The chromosome theory of inheritance states:
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– Mendelian genes have specific loci (positions)on chromosomes– Chromosomes undergo segregation andindependent assortment
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The behavior of chromosomes during meiosiscan account for Mendel’s______________ and__________
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Law of segregation and Independent assortment
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Which characteristics make fruit flies aconvenient organism for genetic studies?
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– They produce many offspring– A generation can be bred every two weeks– They have only four pairs of chromosomes
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What is wild type?
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Normal, phenotypes that are common
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In humans and some other animals, there is achromosomal basis of ____________
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Sex determination
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In humans and other mammals, there are twovarieties of sex chromosomes:
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A larger X chromosome and a smaller Y chromosome
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Only the ends of the _____ chromosome haveregions that are homologous with correspondingregions of the ___ chromosome
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Y, X
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The______ gene on the Y chromosome codes fora protein that directs the development of maleanatomical features
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SRY
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A gene that is located on either sex chromosomeis called a__________
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Sex linked gene
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Genes on the X chromosome are called _________
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X-linked
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Genes on the Y chromosome are called_____________
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Y-linked genes; there are few of these
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A _____ frequency of recombination is observedfor any two genes on different chromosomes
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50%
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__________ have genes for many characters unrelated to sex, whereas the _________ mainly encodes genes relatedto sex determination
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X chromosomeY chromosome
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For a recessive X-linked trait to be expressed:
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A female needs two copies of the allele(homozygous)– A male needs only one copy of the allele(hemizygous)
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In _____________, one of the two Xchromosomes in each cell is randomlyinactivated during embryonic development
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Mammalian females
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