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 plantsWhat 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

Answer 1

Answer:

a) (62 +68)/545

b) The two genes are linked.

Explanation:

a) The recombination frequency is equal to:

$Re_{fr} =\frac{number-of-recombinant-offspring}{total-number-of-offspring} *100=\frac{68+62}{545} *100=23.85$%

b) It can be seen that red plants with single flower and yellow with double flower are recombinant, this means that their parental combinations are uneven. This is due to a cross that occurred between the two genes. From the obtained result it can be said that both genes are linked.