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9 Cards in this Set
- Front
- Back
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Polyploid individualshave two or more incomplete sets of chromosomes. |
False |
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Individuals with Down syndrome, Turner syndrome,or Klinefelter syndrome are aneuploid. |
True |
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Reciprocaltranslocations involve an exchange of chromosome segments between twohomologous chromosomes. |
False |
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The centromeres ofmetacentric chromosomes are located toward one end of the chromosome |
False |
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List the four basic types of chromosomerearrangements. |
deletions,duplications, inversions, and translocations |
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Given an individual with a singlerecessive allele, explain how a deletion could result in the expression of therecessive phenotype. |
Ifa recessive allele for a locus is present on one chromosome, and the homologouschromosome contains a deletion of that locus, then the recessive allele will beexpressed, because no wild-type product is produced to mask the recessivephenotype. The normally recessive alleles expressed in individuals heterozygousfor deletions are said to display pseudodominance |
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___________ can cause genes to movefrom one linkage group to another. a.Inversions b.Deletions c.X-rays d.Translocations e.Unequal crossing over |
d. Translocations |
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Approximately ______ of the gametesproduced by an individual heterozygous for a translocation will be nonviable. a.all b.half c.none d.a quarter e.an eighth |
b.half |
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Two nonhomologous chromosomes have thefollowing segments: i.A ·B C D E F G ii.R ·S T U V W X Draw chromosomes that would result fromthe following chromosome rearrangements. |
a.Reciprocaltranslocation of CD and TU: A .B T U E F G R ·S C D V W X b.Reciprocal translocation of CD and W: A ·B W E F G R ·S T U V C D X c.Robertsonian translocation X W V U T S · B C D E F G (A and R segmentswill be lost) |
