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In a population that is not at Hardy-Weinberg equilibrium, the frequency of alleles changes over time. Therefore, any deviations from the five conditions of Hardy-Weinberg equilibrium can alter the genetic variation of a given population. Conditions that change the genetic variability of a population include mutations, natural selection, non-random mating, gene flow, and genetic drift (small population size).
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Trihybrid Crosses

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Some of Mendel’s crosses examined three pairs of contrasting characteristics. Such a cross is called a trihybrid cross. A trihybrid cross is a combination of three individual monohybrid crosses. For example, plant height (tall vs. short), seed shape (round vs. wrinkled), and seed color (yellow vs. green).
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Mismatch Repair01:20

Mismatch Repair

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Telomere dysfunction increases mutation rate and genomic instability.

J A Hackett1, D M Feldser, C W Greider

  • 1Predoctoral Training Program in Human Genetics and Molecular Biology, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.

Cell
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PubMed
Summary
This summary is machine-generated.

Telomere dysfunction, caused by a lack of telomerase, significantly increases mutation rates and genetic instability. This study in yeast reveals telomerase

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Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • Telomere dysfunction is linked to increased tumor incidence and genetic instability in mice.
  • Telomerase plays a crucial role in maintaining telomere length and stability.

Purpose of the Study:

  • To directly investigate the link between telomere dysfunction and genetic instability.
  • To determine the effect of telomerase absence on mutation rates in Saccharomyces cerevisiae.

Main Methods:

  • Assessing mutation rates in the CAN1 gene of est1Delta yeast strains with dysfunctional telomeres.
  • Analyzing the types of mutations, including terminal deletions and chromosome fusions.
  • Investigating telomere repair mechanisms, such as break-induced replication.

Main Results:

  • Mutation rates increased 10- to 100-fold in est1Delta strains with dysfunctional telomeres.
  • The increased mutation rate was primarily due to a higher frequency of terminal deletions.
  • Evidence of chromosome fusions and complex rearrangements suggests a breakage-fusion-bridge mechanism and other instability pathways.

Conclusions:

  • Telomerase absence leads to significant chromosomal instability.
  • Telomere dysfunction directly induces genetic instability.
  • Telomerase acts as an inhibitor of chromosomal instability.