Humans are diploid organisms whose sex is determined by the pair of sex chromosomes present within them. These sex chromosomes are the 23rd pair of chromosomes and are shown as either X and Y chromosomes, or two X chromosomes.
Human sex chromosomes, X and Y, _____.
A. Have the same loci
B. carry the same number of genes
C. are homologous only at the pseudo-autosomal regions
D. only carry sex genes
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