Exam 7: Genetic Linkage and Mapping in Eukaryotes

The rearrangement of alleles by the process of crossing over is called genetic linkage.

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

Twin spotting provides evidence of what genetic event?

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

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

The visual proof that chromosomes exchange pieces of information during crossing over was provided by ________.

Map distances above 50 are considered unreliable due to the occurrence of double-crossovers between the genes.

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

A testcross is always performed between the individual that is heterozygous for the genes to be mapped and an individual who is ________.

An organism that contains patches of tissue that vary for a specific characteristic,such as a pigment,is an example of ________.

Crossing over is more likely to occur between genes that are ________ on a chromosome.

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 What is the chi square value for this data to the nearest hundredth?