Question

When describing Down syndrome, it's important to note that __________.

a. it can be classified as a single-gene disorder
b. it is caused when red blood cells cannot properly form hemoglobin
c. it causes infected males to have low testosterone levels
d. it is usually caused by three copies of chromosome 21

Answer 1

A.

it can be classified as a single-gene disorder

B.

it is caused when red blood cells cannot properly form hemoglobin

C.

it causes infected males to have low testosterone levels

D.

it is usually caused by three copies of chromosome 21

Explanation: D would be your best answer, hope this helps.

Answer 2

The correct answer is d. it is usually caused by three copies of chromosome 21

Down's syndrome refers to a chromosomal condition caused by abnormal cell division wherein an embryo receives three copies of chromosome 21 instead of the usual two copies. An individual born with Down's syndrome is affected with the following mental, physical and psychological symptoms: low intelligence, delays in physical development and growth, weak muscle tone, flat noses, etc.