Question

if in a plant with genotype AaBbCc, gene A and B are completely linked then what will be the Percentage of pollen grains with genotype aBC ?
1)20%
2)10%
3)40%
4)0%​

Answer 1

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Answer 2

If in a plant with genotype AaBbCc, genes A and B are completely linked then the Percentage of pollen grains with genotype will be 0%.

• A and B genes are completely linked, therefore, they will be transferred to the next generation together.
• Linkage means no crossing over takes place between those 2 linked genes.
• Linkage also means that the 2 linked genes are situated on the same Chromosome and have the least recombination frequency i.e the distance between the 2 genes or the ability to cross over.
• Therefore a genotype aBC where only 1 of the linked genes is present - occur due to crossing over between the 2 linked genes is not possible.