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Question
Sex-linked traits of a man are usually present on
Sex-linked traits of a man are usually present on
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Solution
The correct option is A X-chromosome
Human has X and Y sex chromosomes; chromosomes other than sex chromosomes are termed as autosomes. Sex-linked traits are the one which is inherited with sex chromosomes, thus sex-linked characters cannot be present on autosomes which make option B incorrect. The Y is the smallest chromosomes in the human genome (∼ 60 Mb) that have pseudoautosomal regions (PAR), PAR1 and PAR2, located at the terminal region of the short arm (Yp) and the long arm (Yq) respectively. These are homologous regions of Y and X chromosomes. Thus, the genes located within the PAR are inherited as autosomal genes and cannot have sex-specific genes. Rest of Y-chromosome has euchromatic (genetically active) and heterochromatic regions (genetically inert); the presence of numerous highly repeated sequences in the euchromtic region further reduces the possibility of the presence of genes responsible for important biological functions. The small size of Y chromosomes and presence of heterochromatic regions and repeated sequences limits the space available to carry sex-linked genes which are mostly presence of X-chromosome. The correct answer is A.
Human has X and Y sex chromosomes; chromosomes other than sex chromosomes are termed as autosomes. Sex-linked traits are the one which is inherited with sex chromosomes, thus sex-linked characters cannot be present on autosomes which make option B incorrect. The Y is the smallest chromosomes in the human genome (∼ 60 Mb) that have pseudoautosomal regions (PAR), PAR1 and PAR2, located at the terminal region of the short arm (Yp) and the long arm (Yq) respectively. These are homologous regions of Y and X chromosomes. Thus, the genes located within the PAR are inherited as autosomal genes and cannot have sex-specific genes. Rest of Y-chromosome has euchromatic (genetically active) and heterochromatic regions (genetically inert); the presence of numerous highly repeated sequences in the euchromtic region further reduces the possibility of the presence of genes responsible for important biological functions. The small size of Y chromosomes and presence of heterochromatic regions and repeated sequences limits the space available to carry sex-linked genes which are mostly presence of X-chromosome. The correct answer is A.
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