Exam 7: Genetic Linkage and Mapping in Eukaryotes

While mapping two genes in Drosophila,you observe 30 recombinants among 200 total offspring.What is the distance between these genes?

Creighton and McClintock worked with ________ as their model system to show that homologous chromosomes physically exchange genetic information during crossing over.

Another name for a chromosome is a ________,since it contains genes that are often inherited together.

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

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

Two genes that are located on the same chromosome are said to be ________.

The individual who is credited with discovering genetic linkage in Drosophila is ________.

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

Which of the following are necessary characteristics of an organism in order to easily construct a genetic linkage map?

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 an example of a recombination event?

The parental genotypes for a series of crosses are wild-type male fruit flies mated to females with white eyes and miniature wings.The phenotypes of the F1 generation were wild-type females,and males with white eyes,and miniature wings,indicating sex chromosome linkage.These flies were allowed to mate with each other and produced the following offspring: Red eyes,long wings 770 White eyes,miniature wings 716 Red eyes,miniature wings 401 White eyes,long wings 318 Total 2205 How many map units is the gene for eye color from the gene for wing length to the nearest tenth?

Which of the following defines gene linkage?

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

In a mapping experiment with three genes,which phenotype should occur most often in the F₂ offspring?

The locus is the physical place of a gene on a chromosome.

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

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

In a chi square test to determine if two genes are linked or assorting independently,what is the default (null)hypothesis that is tested?

The process of recombination may rarely occur during mitosis.

The first observational evidence that genes may be inherited together rather than by simple Mendelian inheritance was provided by ________.