In a particular plant, there are four flower colors, maroon, orange, gold and ye

Question

In a particular plant, there are four flower colors, maroon, orange, gold and yellow. From crosses among various plants, some known to be true-breeding, and some unknown whether they are true-breeding, you obtain the following results:

true-breeding maroon x true-breeding orange --> all maroon. true-breeding maroon x true-breeding yellow --> all maroon. unknown maroon x true-breeding orange --> 1/2 maroon, 1/2 orange. unknown gold x uknown gold --> 1/2 gold, 1/4 orange, 1/4 yellow. uknown maroon x unknown gold --> 1/2 maron, 1/4 orange, 1/4 gold. No true-breeding gold lines are known. What is the best explanation of these results?

Explanation / Answer

The color for maroon is dominant over all the other colors. Hence a cross between maroon and orange gives all maroon. like wise cross between maroon and yellow also gives all maroon. A cross between heterozygous maroon and orange gives 1:1 maroon and orange. Cross between gold and orange gives gold, orange and yellow. It shows that gold color is incompletely dominant over yellow hence heterozygous for maroon and heterozygous for gold has given 1:2:1 ratio.

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