Explore BrainMass
Share

Explore BrainMass

    To know genotypes and interference through gene map

    This content was COPIED from BrainMass.com - View the original, and get the already-completed solution here!

    Three loci, mitochondrial malate dehydrogenase that forms a and b (MDHa, MDHb), glucouronidase that has forms 1 and 2 (GUS1, GUS2), and a histone gene that has + and - variants(H+, H-), are located on chromosome #7 in humans. Assume that the MDH locus is at position 35, GUS at position 45, and H at position 75. A female whose mother was homozygous for MDHa, GUS2, and H+ and whose father was homozygous for MDHb, GUS1, and H- produces a sample of 1000 egg cells. Give the genotypes and expected numbers of the various types of cells she would produce. Assume no chromosomal interference.

    © BrainMass Inc. brainmass.com October 9, 2019, 7:57 pm ad1c9bdddf
    https://brainmass.com/biology/genetics/to-know-genotypes-and-interference-through-gene-map-134496

    Solution Summary

    Since, the MDH locus is at position 35, GUS at position 45, and H at position 75, GUS is in between MDH & H.
    Distance between MDH & GUS = 10 map unit
    Distance between GUS & H = 30 map unit.

    Since % recombinants = map distance
    Hence, for gene MDHa & GUS2 locus :
    10 = No. of recombinants for crossing over between MDHa & GUS2 / 1000 * 100
    Or, No. of recombinants for crossing over between MDHa & GUS2 = 100

    $2.19