Question 1

Which of the three genes, if any, is unlinked to the others?

Accepted Answer

A) T/t 
B) R/r 
C) W/w 
D) All three genes are linked. 
A) T/t 
B) R/r 
C) W/w 
D) All three genes are linked.

Question 2

A dihybrid test cross is made between genes H and I.Four categories of offspring are produced: HI, Hi, hI, and hi.You wish to use the $ \chi$2 test to test the hypothesis that the H and I genes are unlinked.How many degrees of freedom would there be in this test?

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
E) 0 
A) 1 
B) 2 
C) 3 
D) 4 
E) 0

Question 3

Sectors with a different phenotype in an otherwise uniform yeast colony may be evidence of mitotic recombination.

Accepted Answer

A) True 
 B)False

Question 4

In Drosophila, singed bristles (sn) and cut wings (ct) are both caused by recessive, X-linked alleles.The wild type alleles (sn+ and ct+) are responsible for straight bristles and intact wings, respectively.A female homozygous for sn and ct+ is crossed to a sn+ct male.The F1 flies are interbred.The F2 males are distributed as follows   Of these 4 phenotypic classes of offspring, which of the following arose from a parental gamete produced by the F1 females?

Accepted Answer

A) sn+ ct+ and sn+ ct flies 
B) sn+ ct+ flies only 
C) sn ct and sn+ ct+ flies 
D) sn+ ct and sn ct+ flies 
E) sn ct and sn ct+ flies 
A) sn+ ct+ and sn+ ct flies 
B) sn+ ct+ flies only 
C) sn ct and sn+ ct+ flies 
D) sn+ ct and sn ct+ flies 
E) sn ct and sn ct+ flies

Question 5

Suppose the L and M genes are on the same chromosome but separated by 100 map units.What fraction of the progeny from the cross LM/lm * lm/lm would be Lm/lm?

Accepted Answer

A) 10% 
B) 25% 
C) 50% 
D) 75% 
E) 100% 
A) 10% 
B) 25% 
C) 50% 
D) 75% 
E) 100%

Question 6

The R/r and S/s genes are linked and 10 map units apart.In the cross Rs / rS * rs / rs what percentage of the progeny will be Rs / rs?

Accepted Answer

A) 5% 
B) 10% 
C) 25% 
D) 40% 
E) 45% 
A) 5% 
B) 10% 
C) 25% 
D) 40% 
E) 45%

Question 7

If only 100 progeny had been counted and the same proportion observed, how would the p value and the conclusion drawn about linkage change?

Accepted Answer

A) The p value would increase, and the likelihood of linkage increases. 
B) The p value would decrease, and the likelihood of linkage increases. 
C) Neither the p value nor the likelihood of linkage would change. 
D) The p value would decrease, and the likelihood of linkage decreases. 
A) The p value would increase, and the likelihood of linkage increases. 
B) The p value would decrease, and the likelihood of linkage increases. 
C) Neither the p value nor the likelihood of linkage would change. 
D) The p value would decrease, and the likelihood of linkage decreases.

Question 8

The Q gene locus is 10 map units from the R gene locus which is 40 map units from the S gene locus: Q--10 mu--R--40 mu--S
Which interval would likely show the higher ratio of double to single chiasmata?

Accepted Answer

A) Q-R 
B) R-S 
C) The ratios would be the same in the two intervals. 
D) Two chiasmata never occur in the same interval. 
A) Q-R 
B) R-S 
C) The ratios would be the same in the two intervals. 
D) Two chiasmata never occur in the same interval.

Which of the three genes, if any, is unlinked to the others?

A dihybrid test cross is made between genes H and I.Four categories of offspring are produced: HI, Hi, hI, and hi.You wish to use the $\chi$ ² test to test the hypothesis that the H and I genes are unlinked.How many degrees of freedom would there be in this test?

Sectors with a different phenotype in an otherwise uniform yeast colony may be evidence of mitotic recombination.

Suppose the L and M genes are on the same chromosome but separated by 100 map units.What fraction of the progeny from the cross LM/lm * lm/lm would be Lm/lm?

The R/r and S/s genes are linked and 10 map units apart.In the cross Rs / rS * rs / rs what percentage of the progeny will be Rs / rs?

If only 100 progeny had been counted and the same proportion observed, how would the p value and the conclusion drawn about linkage change?

The Q gene locus is 10 map units from the R gene locus which is 40 map units from the S gene locus: Q--10 mu--R--40 mu--S Which interval would likely show the higher ratio of double to single chiasmata?

Genetics: The Study of Biological Information

Mendels Principles of Heredity

Extensions to Mendels Laws

The Chromosome Theory of Inheritance

DNA Structure, Replication, and Recombination

Anatomy and Function of a Gene: Dissection Through Mutation

Gene Expression: The Flow of Information From DNA to RNA to Protein

Digital Analysis of Genomes

Analyzing Genomic Information

The Eukaryotic Chromosome

Chromosomal Rearrangements and Changes in Chromosome Number

Bacterial Genetics

Organellar Inheritance

Gene Regulation in Prokaryotes

Gene Regulation in Eukaryotes

Manipulating the Genomes of Eukaryotes

The Genetic Analysis of Development

The Genetics of Cancer

Variation and Selection in Populations

Genetics of Complex Traits

Filters

Exam 5: Linkage, Recombination, and the Mapping of Genes on Chromosomes

Which of the three genes, if any, is unlinked to the others?

A dihybrid test cross is made between genes H and I.Four categories of offspring are produced: HI, Hi, hI, and hi.You wish to use the χ \chiχ 2 test to test the hypothesis that the H and I genes are unlinked.How many degrees of freedom would there be in this test?

Sectors with a different phenotype in an otherwise uniform yeast colony may be evidence of mitotic recombination.

Suppose the L and M genes are on the same chromosome but separated by 100 map units.What fraction of the progeny from the cross LM/lm * lm/lm would be Lm/lm?

The R/r and S/s genes are linked and 10 map units apart.In the cross Rs / rS * rs / rs what percentage of the progeny will be Rs / rs?

If only 100 progeny had been counted and the same proportion observed, how would the p value and the conclusion drawn about linkage change?

The Q gene locus is 10 map units from the R gene locus which is 40 map units from the S gene locus: Q--10 mu--R--40 mu--S Which interval would likely show the higher ratio of double to single chiasmata?

Genetics: The Study of Biological Information

Mendels Principles of Heredity

Extensions to Mendels Laws

The Chromosome Theory of Inheritance

DNA Structure, Replication, and Recombination

Anatomy and Function of a Gene: Dissection Through Mutation

Gene Expression: The Flow of Information From DNA to RNA to Protein

Digital Analysis of Genomes

Analyzing Genomic Information

The Eukaryotic Chromosome

Chromosomal Rearrangements and Changes in Chromosome Number

Bacterial Genetics

Organellar Inheritance

Gene Regulation in Prokaryotes

Gene Regulation in Eukaryotes

Manipulating the Genomes of Eukaryotes

The Genetic Analysis of Development

The Genetics of Cancer

Variation and Selection in Populations

Genetics of Complex Traits

Filters

A dihybrid test cross is made between genes H and I.Four categories of offspring are produced: HI, Hi, hI, and hi.You wish to use the $\chi$ ² test to test the hypothesis that the H and I genes are unlinked.How many degrees of freedom would there be in this test?