If a sperm successfully fertilizes an oocyte, but the resulting zygote's chromosomes fail to properly segregate during the first mitotic division, which consequence follows?

💡 Explanation

Aneuploidy results because non-disjunction, a failure of homologous chromosomes to separate correctly during cell division, occurs. Therefore, daughter cells will have an abnormal number of chromosomes, rather than proper development, zona hardening or immune rejection.

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