Children born with Down syndrome have inherited an extra chromosome, so their diploid number is 47 rather than 46 chromosomes. What is this genetic condition called?

Question

Quizplus · Accepted Answer

Trisomy 21 is the correct genetic condition that describes individuals born with an extra copy of chromosome 21, leading to a total of 47 chromosomes instead of the typical 46. This condition is also commonly known as Down syndrome.

B) Triploid refers to an individual with three copies of each chromosome, resulting in 69 chromosomes instead of 46. This is a different type of chromosomal abnormality.

C) Haploid 21 is not a recognized genetic condition. Haploid cells contain only one set of chromosomes (23 in humans), while individuals with Down syndrome have an extra set of chromosome 21 paired with their other two sets, resulting in 47 chromosomes in total.

D) Monoploidy refers to an individual with only one set of chromosomes, resulting in 23 chromosomes instead of 46. This is also a different type of chromosomal abnormality.

Children Born with Down Syndrome Have Inherited an Extra Chromosome