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Get genetics reviews and study guides here. Learn about genetics or brush up on your skills. Thorough explanations and practice examples will help you review biology.

Study Guides

showing 51 - 60 of 108
  • 51.

    Variation in the Arrangement of Chromosome Segments Help

    Translocations Chromosomes occasionally undergo spontaneous rupture, or can be induced to rupture in high frequency by ionizing radiation. The broken ends of such chromosomes behave as though they were "sticky" and may rejoin into nonhomologous ...

    Source: McGraw-Hill Professional
  • 52.

    Variation in the Number of Chromosome Segments Help

    Deletions (Deficiencies) Loss of a chromosomal segment may be so small that it includes only a single gene or part of a gene. In this case, the phenotypic effects may resemble those of amutant allele at that locus. For example, the "notch" phenotype of ...

    Source: McGraw-Hill Professional
  • 53.

    Variation in Chromosome Morphology Help

    Isochromosomes A translocation can change the structure of the chromosome both genetically and morphologically. The length of the chromosome may be longer or shorter, depending upon the size of the translocated piece. An inversion does not normally change the ...

    Source: McGraw-Hill Professional
  • 54.

    Human Cytogenetics Help

    Human Cytogenetics Humans have a diploid chromosome number of 46 (23 pairs). When grouped as homologous pairs, the somatic chromosome complement is called a karyotype. Formerly, a chromosome could be distinguished only by its length and the position of its ...

    Source: McGraw-Hill Professional
  • 55.

    Cytogenetics Practice Problems Help

    Review the following concepts if needed: Chromosome Structure for Genetics

    Source: McGraw-Hill Professional
  • 56.

    Cytogenetics Practice Test

    Review the following concepts if needed: Chromosome Structure for Genetics

    Source: McGraw-Hill Professional
  • 57.

    Cytogenetics Practice Problems

    Review the following concepts if needed: Chromosome Structure for Genetics

    Source: McGraw-Hill Professional
  • 58.

    Qualitative vs. Quantitative Traits Help

    Qualitative vs. Quantitative Traits The classical Mendelian traits encountered in the previous chapters have been qualitative in nature; i.e., traits that are easily classified into distinct phenotypic categories. These discrete phenotypes are under the genetic ...

    Source: McGraw-Hill Professional
  • 59.

    Polygenic Traits Help

    Polygenic Traits In the early days of Mendelian genetics it was thought that there was a fundamental difference in the essence of qualitative and quantitative traits. One of the classical examples that helped to bridge the gap between these two kinds of traits is ...

    Source: McGraw-Hill Professional
  • 60.

    The Normal Distribution and Genetics Help

    Normal Distribution The study of a quantitative trait in a large population usually reveals that very few individuals possess the extreme phenotypes and that progressively more individuals are found nearer the average value for that population. This type of ...

    Source: McGraw-Hill Professional
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