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Crossing Over and Recombinants definitions

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  • Gamete
    A haploid reproductive cell containing one allele for each gene, crucial for understanding genetic mapping and inheritance.
  • Independent Assortment
    A principle stating that alleles of different genes segregate into gametes independently when genes are on separate chromosomes.
  • Linkage
    A situation where two genes are located on the same chromosome, causing them to be inherited together more often than not.
  • Crossing Over
    A process during meiosis where homologous chromosomes exchange segments, generating new allele combinations in gametes.
  • Chromatid
    A single DNA-protein strand, either as a sister or non-sister, involved in genetic exchange during meiosis.
  • Homologous Chromosome
    A pair of chromosomes, one from each parent, carrying the same genes but possibly different alleles.
  • Chiasmata
    Physical sites where chromatids exchange genetic material during meiosis, visible under a microscope.
  • Recombinant
    An individual or gamete with a new combination of alleles not found in either parent, resulting from genetic exchange.
  • Parental Type
    A genotype or phenotype in offspring that matches one of the original parents, indicating no crossing over occurred.
  • Chromosomal Marker
    A visible or molecular feature on a chromosome used to track genetic exchange events in experiments.
  • Map Unit
    A measurement of genetic distance between genes, defined by a 1% recombination frequency.
  • Cis Conformation
    An arrangement where dominant alleles of two genes are located on the same chromosome.
  • Trans Conformation
    An arrangement where dominant and recessive alleles of two genes are on the same chromosome but opposite each other.
  • Tetrad
    A structure of four chromatids formed during meiosis, allowing for crossing over between homologous chromosomes.
  • Bivalent
    A pair of homologous chromosomes physically associated during meiosis, facilitating genetic recombination.