If a normal egg is fertilized by a sperm which has an extra chromosome,what will be the chromosomal condition of the zygote?
A) three copies of the affected chromosome and two of all others
B) three copies of all chromosomes
C) four copies of the affected chromosome and two of all others
D) one copy of the affected chromosome and two of all others
E) two copies of all of the chromosomes

Question

Quizplus · Accepted Answer

The extra chromosome from the sperm will result in the zygote having three copies of the affected chromosome and two copies of all others, a condition known as trisomy. This is commonly seen in conditions such as Down syndrome. Therefore, option A is the best choice.

If a Normal Egg Is Fertilized by a Sperm Which