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B
Blood group
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C
Thymus activity
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D
Shape of nose
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Solution
The correct option is A Maleness
Humans have a total of 23 pairs of chromosomes which are a set consisting of autosomes which are numbered accordingly to their size from largest to smallest. The Y-Chromosomes have base pairs approximated to 58 million which contains over 200 sets of genes from which 72 are coded exclusively for proteins and is the smallest human gene.