Question

Describe how a zygote with trisomy 21 is likely to
occur during fertilization.

Answer 1

If the paired chromosomes fail to separate during meiosis in the female, then the resulting daughter cells will receive either 2 or no copies of chromosome 21. If the resulting egg with 2 copies of chromosome 21 is fertilized with a normal sperm, the resulting zygote with be trisomy 21

Step-by-step explanation: