Whether a fetus will be born with Down syndrome is related to ...

[sheilaspns]

Whether a fetus will be born with Down syndrome is related to
 
  a. the age of the mother at the time of pregnancy.
  b. the presence of specific amino acids in the mother's diet.
  c. overexposure to toxins during pregnancy.
  d. ingestion of drugs and alcohol by the father prior to conception.
  e. the uterine environment during pregnancy.

Question 2

The mental retardation shown in Down syndrome is caused by
 
  a. the absence of the 21st chromosome.
  b. a buildup of waste products in the neurons of brain.
  c. a genetic error involving a missing vital enzyme.
  d. the presence of an extra 21st chromosome.
  e. an inherited faulty gene.

[stanleka1]

Answer to Question 1

Answer: a. the age of the mother at the time of pregnancy.

Answer to Question 2

Answer: d. the presence of an extra 21st chromosome.

[sheilaspns]

Excellent

[Hdosisshsbshs]

Gracias!