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title: "Part 8 EXTRA MATERIAL: Whole Genome Selection"
canonical: "https://wiki.groenkennisnet.nl/space/GB/12288165/Part%208%20EXTRA%20MATERIAL%3A%20Whole%20Genome%20Selection"
format: markdown
---
Whole genome selection is a method to gain **speed to market**. The principle is that during the introgression of a gene from a wild relative into a commercial parent line (the recurrent parent) those plants are chosen with the highest content of recurrent plant.

Below is an example of a F2 population from a cross between two onion species. The percentage of the genome content of one of the parents (*Allium cepa*) is monitored in the individuals of the F2 population.

![image](media://4b90349a-ef19-4860-ae91-7542e972c665)

*Figure 2. The percentage of A. cepa alleles in individual F2 plants sorted from low to high in a population of 65 plants*

  


![image](media://bd34524c-3aa2-41ff-b95a-dc496c69b294)

*Figure 3. In figure 3 examples are shown of the percentage recurrent parent of 1 to 4 BC1 plants (black dots) of 6 BC2 populations and percentages recurrent parent in these BC2 plants (blue dots). *

  


**Question Whole Genome Selection. **

8.1 What is the theoretical expectation of the presence of the donor parent (donor of whitefly resistance) compared to the recurrent parent (elite line).

8.2 Expectations and gains:

![image](media://bf2c7596-6f4b-4750-a5cf-653da7d3112e)