CHAPTER 6 Genetic Linkage and Mapping in Eukaryotes
Ascus Sac that contains haploid spores of fungi
Coefficient of Coincidence (C) Measure of interference (the reduction in the probability
of occurrence of crossover at one location on a
chromosome) in the formation of chromosomal
crossovers during meiosis; if there is a crossover at one
spot on a chromosome, it decreases the likelihood of a
crossover in a nearby spot.
𝑎𝑐𝑡𝑢𝑎𝑙 𝑓𝑟𝑒𝑞𝑢𝑒𝑛𝑐𝑦 𝑜𝑓 𝑟𝑒𝑐𝑜𝑚𝑏𝑖𝑛𝑎𝑛𝑡𝑠
× 100%
𝑒𝑥𝑝𝑒𝑐𝑡𝑒𝑑 𝑓𝑟𝑒𝑞𝑢𝑒𝑛𝑐𝑦 𝑜𝑓 𝑟𝑒𝑐𝑜𝑚𝑏𝑖𝑛𝑎𝑛𝑡
Genetic Recombination Process in which alleles are assorted and passed to
offspring in combinations that are different from those
found in the parents
Mitotic Recombination Crossing over that occurs during mitosis and produces
a pair of recombinant chromosomes
Nonparental Combination of traits that affects the phenotype in the
true-breeding parental generation AKA ‘recombinant’
Nonparental Ditype (NPD) Ascus that contains four spores that all have a non-
parental combination of alleles
Parental Ditype (PD) Ascus that contains four spores with the parental combi-
nations of alleles
Recombinant Cells For linked genes, refers to cells that are the product of
crossing over
Recombinant Offspring An offspring that has inherited a combination of
alleles/combination of traits that is different from either
of their parents. For unlinked genes, recombinant
offspring are produced via independent assortment. For
linked genes, recombinant offspring are produced by
crossing over.
Synteny Situation in which two or more genes are located on the
same chromosome
Ascus Sac that contains haploid spores of fungi
Coefficient of Coincidence (C) Measure of interference (the reduction in the probability
of occurrence of crossover at one location on a
chromosome) in the formation of chromosomal
crossovers during meiosis; if there is a crossover at one
spot on a chromosome, it decreases the likelihood of a
crossover in a nearby spot.
𝑎𝑐𝑡𝑢𝑎𝑙 𝑓𝑟𝑒𝑞𝑢𝑒𝑛𝑐𝑦 𝑜𝑓 𝑟𝑒𝑐𝑜𝑚𝑏𝑖𝑛𝑎𝑛𝑡𝑠
× 100%
𝑒𝑥𝑝𝑒𝑐𝑡𝑒𝑑 𝑓𝑟𝑒𝑞𝑢𝑒𝑛𝑐𝑦 𝑜𝑓 𝑟𝑒𝑐𝑜𝑚𝑏𝑖𝑛𝑎𝑛𝑡
Genetic Recombination Process in which alleles are assorted and passed to
offspring in combinations that are different from those
found in the parents
Mitotic Recombination Crossing over that occurs during mitosis and produces
a pair of recombinant chromosomes
Nonparental Combination of traits that affects the phenotype in the
true-breeding parental generation AKA ‘recombinant’
Nonparental Ditype (NPD) Ascus that contains four spores that all have a non-
parental combination of alleles
Parental Ditype (PD) Ascus that contains four spores with the parental combi-
nations of alleles
Recombinant Cells For linked genes, refers to cells that are the product of
crossing over
Recombinant Offspring An offspring that has inherited a combination of
alleles/combination of traits that is different from either
of their parents. For unlinked genes, recombinant
offspring are produced via independent assortment. For
linked genes, recombinant offspring are produced by
crossing over.
Synteny Situation in which two or more genes are located on the
same chromosome
