Grade 12 Gene Mapping Worksheet
This worksheet covers key concepts in gene mapping, including linkage, recombination frequency, and mapping units, suitable for Grade 12 Biology students.
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Grade 12 Gene Mapping Worksheet
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Read each question carefully and answer to the best of your ability. Show all your work for calculation-based problems.
1. What is the primary purpose of gene mapping?
To determine the nucleotide sequence of a gene.
To locate the positions of genes on a chromosome.
To analyze protein structure.
To identify genetic disorders.
2. What does a recombination frequency of 50% between two genes indicate?
The genes are tightly linked.
The genes are on different chromosomes or very far apart on the same chromosome.
The genes are located in a centromere.
A mutation has occurred.
3. One map unit (centimorgan) is equivalent to a recombination frequency.
4. The phenomenon where genes located on the same chromosome are inherited together is called .
5. The closer two genes are on a chromosome, the higher their recombination frequency.
True
False
6. Gene mapping can be used to predict the inheritance patterns of genetic diseases.
True
False
7. Explain how crossing over contributes to genetic recombination and its role in gene mapping.
8. In a dihybrid cross involving two linked genes, what would you expect the phenotypic ratio to be if there was no crossing over?
Match each term on the left with its definition on the right.
9. Linkage
a. The process of determining the relative positions of genes on a chromosome.
10. Recombination Frequency
b. The tendency of genes located close together on a chromosome to be inherited together.
11. Gene Mapping
c. The percentage of recombinant offspring in a dihybrid cross.
12. In a test cross, you observe 300 parental offspring and 200 recombinant offspring. Calculate the recombination frequency and the distance between these two genes in map units.
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