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Question
Four inbred lines of wheat are crossed. The cross is called
Four inbred lines of wheat are crossed. The cross is called
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Solution
The correct option is A Double cross
In double-cross hybrid, two stages of the crossing of two pairs of inbreds or four inbreed lines are involved. In Step 1, two pairs of inbreds are crossed to produce single-cross hybrids. In Step 2, the two single-cross hybrids produced in Step 1 are crossed to produce the double-cross. Double-cross hybrid is important in the production of organic corn, wheat where the herbicides are not used. Therefore, seed producers desire parents that have good vigor and can compare successfully against weeds.
In double-cross hybrid, two stages of the crossing of two pairs of inbreds or four inbreed lines are involved. In Step 1, two pairs of inbreds are crossed to produce single-cross hybrids. In Step 2, the two single-cross hybrids produced in Step 1 are crossed to produce the double-cross. Double-cross hybrid is important in the production of organic corn, wheat where the herbicides are not used. Therefore, seed producers desire parents that have good vigor and can compare successfully against weeds.
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