Exam 6: Genetic Linkage and Mapping in Eukaryotes

A genetic linkage map indicates that precise distance between two genes of interest.

Which of the following is not one of the principles of linkage that Morgan obtained from his experiments?

A map distance of 23.6 between two genes indicates which of the following?

The number of linkage groups in a species that does not have sex chromosomes is:

Which of the following statistical tests is used to determine if two genes are linked or assorting independently?

A negative interference value indicates that the first crossover event enhanced the occurrence of additional crossover events in the region.

A fungal reproductive structure that contains all of the products of a single meiotic division is called the ascus.

In humans, there are _______ autosomal linkage groups, plus an X and Y chromosome linkage group.

Map distance is the number of recombinant offspring divided by the total number of nonrecombinant offspring.

In fungal gene mapping, the abbreviation NPD stands for new parental ditype.

In ascomycete fungi, the arrangement of the spores in the ascus that directly reflects the order in which they were produced during meiosis is called an ______.

Which of the following defines the principle of linkage?

Following crossing-over, chromosomes with genetic combinations that resemble the parents' chromosomes are called nonrecombinant.

In a mapping cross, you determine that the recombination frequency between: Loci Q and P is 12% Loci Q and L is 15%. If locus Q is in between loci P and L, then the recombination frequency between P and L should be approximately:

The end result of meiosis in fungi is a tetrad of spores.

The locus B on the X chromosome of a malaria-carrying mosquito shows a 49% recombination rate with respect to the locus M. Since a recombination rate of 50% is essentially indistinguishable from independent assortment, you might be tempted to look for a locus that falls between B and M. Before you decide to do all that work, you run a chi square test to determine the P value of your experiment. Which of the following P values would be most likely to tell you that you should accept the conclusion that locus B and locus M are, indeed, 49mu apart and that another locus is not necessary?

The middle gene of a three gene mapping experiment can be determined by examining the genotypes of which of the following?

Experimental evidence that crossing over occurs between the X chromosomes of female Drosophila was provided by __________.

Assume that genes C and D are located on the same chromosome. On one chromosome, alleles C and D are found, while the homologue contains alleles c and d. Which of the following would be evidence of a recombination event?

A map unit or centimorgan is equal to a 10% recombination frequency.