Recombination frequency

Definition

Recombination frequency is the proportion of recombinant offspring produced in a genetic cross. It measures the likelihood of crossing over between two genes during meiosis.

5 Must Know Facts For Your Next Test

1. Recombination frequency is expressed as a percentage.
2. It is used to map the relative positions of genes on chromosomes.
3. A recombination frequency of 50% indicates that the genes are likely unlinked and assort independently.
4. Lower recombination frequencies suggest closer proximity of genes on a chromosome.
5. Recombination frequencies can be used to construct genetic linkage maps.

Review Questions

• What does a recombination frequency of 50% indicate about the relationship between two genes?
• How can recombination frequency help in constructing genetic linkage maps?
• Why do lower recombination frequencies suggest closer gene proximity on a chromosome?

Related terms

Genetic Linkage: The tendency of alleles that are close together on a chromosome to be inherited together during meiosis.

Crossing Over: The process where homologous chromosomes exchange portions of their chromatids during meiosis, leading to genetic variation.

Linkage Map: A genetic map showing the relative locations of genes on a chromosome based on recombination frequencies.