A human female has a diploid chromosome number of 46 (2n = 46). Based on this information, which of the following cells is NOT properly matched with its chromosome number?

a. first polar body: 23 chromosomes
b. secondary oocyte: 46 chromosomes
c. diploid precursor cell: 46 chromosomes
d. egg: 23 chromosomes

b. secondary oocyte: 46 chromosomes

This is not properly matched because a secondary oocyte should have 23 chromosomes, not 46.