The Australian grass tree, from the genus Xanthorrhoea in the lily family, grows to a height of about 4.5 m, bears long narrow leaves in a tuft at the top of the trunk, and produces yellow or white flowers in a spike above the leaves. A yellow-flowered tree was test-crossed. The seeds were collected and planted. The resulting progeny were 28 white-flowered trees and 23 yellow-flowered trees.

Question

The Australian grass tree, from the genus Xanthorrhoea in the lily family, grows to a height of about 4.5 m, bears long narrow leaves in a tuft at the top of the trunk, and produces yellow or white flowers in a spike above the leaves.  A yellow-flowered tree was test-crossed.  The seeds were collected and planted.  The resulting progeny were 28 white-flowered trees and 23 yellow-flowered trees.

What is the expected phenotypic ratio of white-flowering grass trees to yellow-flowering grass trees among the progeny that result from the cross?

Enter your answer in the format yellow:white (for example you would enter 10:3 if you expect that that the phenotypic ratio should be 10 yellow-flowering trees for every 3 white flowering trees).

what is the ratio

Anonymous · Answer

1:2