A Neurospora cross was made between a strain that carried the mating-type allele A and the mutant allele arg-1 and another strain that carried the mating-type allele a and the wild-type allele for arg-1 (+). Four hundred linear octads were isolated, and they fell into the seven classes given in the table below. (For simplicity, they are shown as tetrads.) a. Deduce the linkage arrangement of the mating-type locus and the arg-1 locus. Include the centromere or centromeres on any map that you draw. Label all intervals in map units. b. Diagram the meiotic divisions that led to class 6. Label clearly
Genetic Recombination
Recombination is crucial to this process because it allows genes to be reassorted into diverse combinations. Genetic recombination is the process of combining genetic components from two different origins into a single unit. In prokaryotes, genetic recombination takes place by the unilateral transfer of deoxyribonucleic acid. It includes transduction, transformation, and conjugation. The genetic exchange occurring between homologous deoxyribonucleic acid sequences (DNA) from two different sources is termed general recombination. For this to happen, an identical sequence of the two recombining molecules is required. The process of genetic exchange which occurs in eukaryotes during sexual reproduction such as meiosis is an example of this type of genetic recombination.
Microbial Genetics
Genes are the functional units of heredity. They transfer characteristic information from parents to the offspring.
A Neurospora cross was made between a strain that carried the mating-type allele A and the mutant allele arg-1
and another strain that carried the mating-type allele a
and the wild-type allele for arg-1 (+). Four hundred linear octads were isolated, and they fell into the seven
classes given in the table below. (For simplicity, they are
shown as tetrads.)
a. Deduce the linkage arrangement of the mating-type
locus and the arg-1 locus. Include the centromere or
centromeres on any map that you draw. Label all intervals
in map units.
b. Diagram the meiotic divisions that led to class 6. Label
clearly
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