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Question
In Grasshopper, rosy body colour is caused by a recessive mutation. The wild -type body colour is green. If the gene for body colour is on the X-chromosome, what kind of progeny would be obtained from a mating between a rosy female and a wild -type male?
In Grasshopper, rosy body colour is caused by a recessive mutation. The wild -type body colour is green. If the gene for body colour is on the X-chromosome, what kind of progeny would be obtained from a mating between a rosy female and a wild -type male?
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Solution
The correct option is C All the daughters will be green and all the sons will be rosy
Let the recessive mutant chromosome be denoted by X'A female can show rosy colour only if it is present on both sex chromosomes (X'X') while (X'X) female would show green colour and act as carrier of the mutant gene. A cross between wild type male (XY) and rosy female (X'X') will give X'X, X'X, X'Y, X'Y ,i.e., 50% carrier females and 50% affected males. Thus, the correct answer is 'All the daughters will be green and all the sons will be rosy.'
Let the recessive mutant chromosome be denoted by X'
A female can show rosy colour only if it is present on both sex chromosomes (X'X') while (X'X) female would show green colour and act as carrier of the mutant gene.
A cross between wild type male (XY) and rosy female (X'X') will give X'X, X'X, X'Y, X'Y ,i.e., 50% carrier females and 50% affected males.
Thus, the correct answer is 'All the daughters will be green and all the sons will be rosy.'
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