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Considering two traits, an individual that is heterozygous for both genes is crossed with an individual...

Considering two traits, an individual that is heterozygous for both genes is crossed with an individual that is also heterozygous for both genes. Based on the offspring, how could you determine if the two genes are linked or not?

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Answer #1

Based on the Phenotype of the off-spring, we can determine if any 2 given genes are linked or not. To understand this, we have to first understand Mendel's Law of Independent Assortment. This law states that every trait is inherited independently of every other trait.

When any cross follows this, the Phenotype of the offsprings, will be in the ratio of 3:1 i.e., 3 dominant and 1 recessive offspring will be produced. ( details in the figure)

When any cross doesn't follow this law, the output is in the ratio of 1:1. This is when we can conclude that the genes are linked.

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