55. fusion of the male and female pronuclei a) results in an oocyte forming. d) results in a haploid cell forming. b) restores the diploid number of chromosomes. e) results in a total of 23 chromosomes. c) occurs before ovulation.

B) restores the diploid number of chromosomes.

Explanation:

A pronuclei is the nucleus of a male (sperm) or female (egg cell) reproductive cell during fertilization (fusion of gametes). These pronuclei possess the genetic material that will eventually fuse when their membranes dissolve, their chromosomes then combine and become an embryo with a diploid nucleus that will contain a full set of chromosomes (23+23=46 chromosomes.)

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