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.

• If a marathon runner maintains a high pace beyond their anaerobic threshold, which consequence becomes most likely?
• Why does a subsequent exposure to pollen provoke a stronger allergic reaction in sensitized individuals compared to the initial exposure?
• If a patient with retinitis pigmentosa experiences increasing peripheral vision loss, what explains why gene therapy targeting photoreceptor survival might fail to fully restore vision?
• An endurance athlete's cardiac output increases substantially during exercise. What distinguishes the mechanism enabling this increased output from the response in someone with advanced heart failure?
• Why does vaccine efficacy often increase after multiple doses, even with the same antigen?
• Why does bone density decrease in elderly individuals experiencing sarcopenia impact resistance differently from younger individuals?