Trisomy Could Result From

Question

Trisomy could result from
A)an ovum of 24 chromosomes fertilized by a sperm with 23 chromosomes.
B)an ovum of 22 chromosomes fertilized by a sperm with 23 chromosomes.
C)an ovum of 23 chromosomes fertilized by a sperm with 23 chromosomes.
D)None apply.

Accepted Answer

Trisomy refers to a condition where an individual has three copies of a particular chromosome instead of the typical two copies. Trisomy can occur due to non-disjunction during cell division, where chromosomes fail to separate properly. In the case of trisomy, an ovum (egg cell) with an extra copy of a chromosome is fertilized by a sperm cell, resulting in a zygote with three copies of that chromosome. Option A matches this scenario, where an ovum with 24 chromosomes (an extra copy of one chromosome) is fertilized by a sperm with 23 chromosomes, resulting in a zygote with 47 chromosomes and trisomy of the corresponding chromosome. Options B and C do not match the scenario of trisomy. Option D is incorrect as one option matches the scenario of trisomy.