A series of genetic crosses are planned to determine whether the genes for two c

Question

A series of genetic crosses are planned to determine whether the genes for two characters are linked or unlinked. It is known from previous work that both characters exhibit a complete dominance inheritance pattern. In this particular species of flowers, yellow color is dominant to red color, and single blossoms are dominant to double blossoms. Dihybrid yellow, single blossomed flowers are crossed with red, double blossomed flowers. The following phenotype frequencies are observed among the 545 offspring: 200 yellow, single blossomed plants 215 red, double blossomed plants 62 red, single blossomed plants 68 yellow, double blossomed plants What is the recombination frequency between these two genes? (62 +68)/545 O (200 68)/545 545/(6268) (200+215+62 68)/545 (200+215)/545 (215 62)/545 the two genes are linked the two genes are not linked From these results one can conclude that O if the genes are linked, they are separated far enough apart to appear to assort independently

Explanation / Answer

The recombination frequency between these two genes will be- (Number of recombinant offspring/ Total number of offspring) X 100

= (62+68)/545

= 23.85

Here red single blossomed and yellow double blossomed plants are recombinant that means they are unlike parental combinations. They are the result of crossing over between the two genes.

From the results one can conclude that -the two genes are linked.

Because if they are not linked we would get 9:3:3:1 ratio.

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