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Mapping Genes definitions

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  • Recombination Frequency
    Percentage value representing how often recombinant offspring appear, directly correlating with gene distance on a chromosome.
  • Map Distance
    Measurement, often in map units, indicating the physical separation between genes based on recombination data.
  • Map Unit
    Unit equivalent to a 1% recombination frequency, used to express genetic distances between loci.
  • Parental Type
    Offspring whose phenotype matches one of the original parents in a genetic cross.
  • Recombinant Type
    Offspring displaying new combinations of traits not seen in either parent, resulting from genetic recombination.
  • Genetic Linkage
    Condition where genes located close together on a chromosome tend to be inherited together due to low recombination.
  • Independent Assortment
    Mendelian principle stating that genes on different chromosomes segregate into gametes independently.
  • Physical Map
    Gene mapping approach using DNA sequencing to pinpoint exact nucleotide positions of genes on chromosomes.
  • Genomic Sequencing
    Technique for determining the precise order of nucleotides in an organism’s DNA, enabling physical gene mapping.
  • Single Nucleotide Polymorphism
    Genomic marker involving a single base change, useful for locating genes and studying genetic variation.
  • Restriction Fragment Length Polymorphism
    Variation in DNA sequence detected by restriction enzyme cuts, serving as a marker for gene mapping.
  • Microsatellite
    Short, repetitive DNA sequence scattered throughout the genome, valuable for identifying gene locations.
  • Crossover
    Exchange of genetic material between homologous chromosomes, leading to new allele combinations in offspring.
  • Tester
    Individual with a known genotype used in crosses to reveal the genotype of another organism.
  • Homozygous
    Genetic condition where both alleles at a locus are identical, either dominant or recessive.