Two different genes are located on the same chromosome, but their exact position

Question

Two different genes are located on the same chromosome, but their exact position in not known. Individual 1 and 2 have the genotypes shown below. The parallel lines represent homologous chromosomes. Individual #1: A B a b Individual #2: a b a b How likely is it that these individuals will have an offspring with the following genotype: A b a b More likely if the two genes are close together on the chromosome More likely if the two genes are far apart on the chromosome Equally likely no matter where the genes are located on the chromosome

Explanation / Answer

When the genes are located on the same chromosomes, it means they are linked.

So the individuals 1 and 2 produce gametes

AB, ab and ab respectively.

The F1 individual might have genotypes either AaBb or aabb

If the offspring having a genotype Aabb will happen when there is recombination in the individual 1 who produces gametes Ab and aB.

If might happen more likely when the genes are present far apart on the chromosome. The recombination frequency increases with the increase in distance between the genes.

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