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Question
In which of these the sex chromosome have discovered for the first time?
In which of these the sex chromosome have discovered for the first time?
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Solution
The correct option is A Melandrium
The sex chromosome have discovered for the first time in Melandrium which have XX-XY mechanism of sex determination, where male plant is heterogametic and carries “XY” sex chromosome while female plant carries two copies of X-chromosomes (XX) as sex chromosomes. Irrespective of ratio of number of X–chromosomes to set of autosomes, presence of Y-chromosome determines male sex of the plant. Chromosomes other than sex chromosomes are called as autosomes and are represented by “A”. As is evident from independence of sex of plant to X/A ratio, A-chromosomes are not sex determinant in this plant. Thus, correct answer is A.
The sex chromosome have discovered for the first time in Melandrium which have XX-XY mechanism of sex determination, where male plant is heterogametic and carries “XY” sex chromosome while female plant carries two copies of X-chromosomes (XX) as sex chromosomes. Irrespective of ratio of number of X–chromosomes to set of autosomes, presence of Y-chromosome determines male sex of the plant. Chromosomes other than sex chromosomes are called as autosomes and are represented by “A”. As is evident from independence of sex of plant to X/A ratio, A-chromosomes are not sex determinant in this plant. Thus, correct answer is A.
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