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 10
A geneticist finds that two genes are inherited together 98% of the time. What does this suggest about their location?
A scientist finds that two genes have a recombination frequency of 45%. What does this suggest about their location?
Describe how a test cross can be used to determine gene linkage.
Describe one limitation of genetic mapping.
A geneticist finds that two genes are inherited together 98% of the time. What does this suggest about their location?
A geneticist observes a recombination frequency of 20% between two genes. Are these genes likely to be on the same chromosome?
A scientist finds that two genes have a recombination frequency of 45%. What does this suggest about their location?
A researcher is mapping three genes (X, Y, and Z) on the same chromosome. The recombination frequency between X and Y is 12%, between Y and Z is 7%, and between X and Z is 19%. Based on this data, what is the most likely order of the genes on the chromosome?
Which of the following best describes a linkage group?
(1) All genes in a species
(2) Genes located on the same chromosome
(3) Genes with similar functions
(4) Genes that mutate together
Which of the following best describes a test cross?
(1) Crossing two homozygous individuals
(2) Crossing an individual with a homozygous recessive individual
(3) Crossing two heterozygous individuals
(4) Crossing two unrelated individuals
Which of the following is a correct statement about recombination?
(1) It only occurs in prokaryotes
(2) It increases genetic diversity
(3) It prevents genetic mapping
(4) It only happens in somatic cells
Which of the following is a limitation of using recombination frequency to map genes?
(1) It cannot detect very close genes
(2) It is only accurate for genes far apart
(3) Double crossovers can lead to underestimation of distance
(4) All of the above
Fill in the blank: A recombination frequency of 50% suggests that two genes are ________.
Fill in the blank: Genes that are far apart on the same chromosome are ________ likely to be separated by crossing over than genes that are close together.
Fill in the blank: The first genetic map was created using the fruit fly, ________.
Fill in the blank: The frequency of crossing over between two genes is used to estimate their ________ on a chromosome.
A geneticist observes a recombination frequency of 20% between two genes. Are these genes likely to be on the same chromosome?
True or False: Crossing over occurs during mitosis.
True or False: Genes that are 50 cM apart behave as if they are unlinked.
True or False: Genes that are close together on a chromosome are more likely to be inherited together.
