Genetic Mapping
Biology ⇒ Genetics and Heredity
Genetic Mapping starts at 10 and continues till grade 12.
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See sample questions for grade 12
A geneticist finds that two genes are 25 cM apart. What is the expected percentage of recombinant offspring?
A geneticist is mapping three genes: A, B, and C. The recombination frequency between A and B is 5%, between B and C is 10%, and between A and C is 15%. What is the most likely order of the genes?
A geneticist observes that two genes have a recombination frequency of 0%. What does this indicate about their location?
A scientist observes 1000 offspring from a test cross. 200 show recombinant phenotypes. What is the recombination frequency?
A geneticist is mapping three genes: A, B, and C. The recombination frequency between A and B is 5%, between B and C is 10%, and between A and C is 15%. What is the most likely order of the genes?
A scientist observes 1000 offspring from a test cross. 200 show recombinant phenotypes. What is the recombination frequency?
A geneticist observes the following offspring numbers from a dihybrid test cross: 410 parental type 1, 390 parental type 2, 100 recombinant type 1, and 100 recombinant type 2. Calculate the recombination frequency and explain what this indicates about the linkage between the two genes.
A researcher is mapping four genes (W, X, Y, Z) on a chromosome. The recombination frequencies are as follows: W-X = 8%, X-Y = 12%, Y-Z = 5%, and W-Y = 20%. Based on this data, determine the most likely linear order of the genes and calculate the map distance between W and Z.
Which of the following best describes a linkage group?
(1) All genes on a single chromosome
(2) All genes in the genome
(3) Genes that are not linked
(4) Genes on different chromosomes
Which of the following is a direct result of crossing over during meiosis?
(1) Genetic linkage
(2) Genetic recombination
(3) Mutation
(4) DNA replication
Which of the following is a limitation of genetic mapping?
(1) It cannot detect very small distances between genes
(2) It is only applicable to plants
(3) It can only be used for physical mapping
(4) It is not based on recombination
Which of the following is a reason why genetic maps may not always correspond to physical maps?
(1) Recombination rates vary across the chromosome
(2) All genes are equally spaced
(3) Physical maps are based on recombination
(4) Genetic maps use base pairs as units
Fill in the blank: A ________ is a diagram that shows the relative locations of genes on a chromosome based on recombination frequencies.
Fill in the blank: A ________ map shows the order of genes and the relative distances between them on a chromosome.
Fill in the blank: Genes that are located close together on the same chromosome are said to be ________.
Fill in the blank: The first genetic map was constructed using the fruit fly, ________.
True or False: Genes that are far apart on the same chromosome are more likely to be separated by crossing over than genes that are close together.
True or False: Genetic mapping can be used to identify the location of disease-causing genes in humans.
True or False: Linked genes always assort independently.
True or False: Physical maps and genetic maps always show the same order and distance between genes.
