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Genetic Variation01:25

Genetic Variation

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Genetic variation is the diversity in DNA sequences found among individuals of the same species. This diversity is crucial for a species' survival because it helps organisms adapt to environmental changes. Genetic variation begins with fertilization, where an egg and sperm cell merge. Each of these cells carries 23 chromosomes, up to 46 in the fertilized egg. Chromosomes are long DNA strands that contain genes, the basic units of heredity.
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Genetic Material01:20

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Within the human body, a complex and detailed system of trillions of cells works in unison to sustain life. Each cell houses a nucleus, which contains 46 chromosomes divided into 23 pairs. Chromosomes are highly coiled structures made of the genetic material DNA. These chromosomes are essential carriers of genetic information, with half inherited from the mother through her egg and the other half from the father's sperm, combining to create the unique genetic makeup of an individual.
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Genetic screens are tools used to identify genes and mutations responsible for phenotypes of interest. Genetic screens help identify individuals or a group of people at risk of developing  genetic diseases and help them with early intervention, targeted therapy, and reproductive options.
Forward genetic screens
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In most organisms, sex is determined by the ratio of X and Y chromosomes. However, in some organisms, such as Drosophila and C.elegans, sex is determined by the ratio of the number of X chromosomes to the number of sets of autosomes. The Y chromosome in Drosophila is active but does not determine sex. It contains genes responsible for the production of sperms in adult flies.  
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Trihybrid Crosses
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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Mapping Bacterial Functional Networks and Pathways in Escherichia Coli using Synthetic Genetic Arrays
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Orthogonal Genetic Systems.

John C Chaput1, Piet Herdewijn2, Marcel Hollenstein3

  • 1Departments of Pharmaceutical Sciences, Chemistry, and Molecular Biology and Biochemistry, University of California, 101 Theory, Irvine, CA, 92617, USA.

Chembiochem : a European Journal of Chemical Biology
|January 1, 2020
PubMed
Summary
This summary is machine-generated.

Xenobiology uses synthetic xeno-nucleic acid (XNA) polymers to safeguard engineered cells. Designing XNA systems requires understanding backbone structures for replication without interfering with the cell's natural genome.

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Area of Science:

  • Synthetic biology
  • Xenobiology
  • Molecular biology

Background:

  • Xenobiology aims to protect genetically engineered cells using synthetic xeno-nucleic acid (XNA) polymers.
  • Establishing cellular systems capable of maintaining XNA chromosomes in dividing cells is crucial for xenobiology's success.

Purpose of the Study:

  • To discuss structural parameters of nucleic acid backbones for designing orthogonal genetic systems.
  • To enable XNA replication without interference from the endogenous genome.

Main Methods:

  • Review and discussion of structural parameters for nucleic acid backbone design.
  • Consideration of orthogonality in genetic system replication.

Main Results:

  • Identified key structural parameters for designing XNA systems.
  • Highlighted the importance of backbone structure for orthogonal replication.

Conclusions:

  • Designing XNA requires careful consideration of backbone structure to ensure cellular viability and genetic orthogonality.
  • Studies on XNA offer fundamental insights into unnatural nucleic acid polymer properties.