Grade 11 Gene Mapping Worksheet
This worksheet covers fundamental concepts of gene mapping, including recombination frequency, linkage, and mapping techniques relevant to Grade 11 Biology.
Includes
Standards
Topics
Gene Mapping Fundamentals
Name:
Date:
Score:
Read each question carefully and answer to the best of your ability. Show all work for calculations.
1. What does a recombination frequency of 50% indicate about two genes?
The genes are tightly linked.
The genes are on different chromosomes or are very far apart on the same chromosome.
The genes are located on sex chromosomes.
The genes are lethal when combined.
2. A centimorgan (cM) is a unit of genetic distance that represents:
100 base pairs of DNA.
1% recombination frequency.
The distance between two alleles on homologous chromosomes.
The physical length of a chromosome.
3. The closer two genes are on a chromosome, the likely they are to be separated by crossing over.
4. Gene mapping helps determine the order of genes on a chromosome.
5. A test cross involves mating an individual of unknown genotype with a recessive individual.
6. Linkage maps provide the physical distances between genes in base pairs.
True
False
7. Recombination frequency is directly proportional to the distance between genes.
True
False
8. Explain the concept of genetic linkage and how it relates to gene mapping.
9. In a dihybrid cross, if the observed recombination frequency between two genes is 20%, what is the genetic distance between them in centimorgans (cM)?
10. Imagine three genes, A, B, and C, are located on the same chromosome. The recombination frequency between A and B is 10%, and between B and C is 5%. What is the most likely recombination frequency between A and C, and what is the probable order of these genes on the chromosome? Explain your reasoning.