« previous next »

Author Question: What is the source of the extra chromosome 21 in an individual with Down syndrom (Read 454 times)

Hungry!

  • Hero Member
  • *****
  • Posts: 1,071
on: Jun 21, 2013
What is the source of the extra chromosome 21 in an individual with Down syndrome?
A) nondisjunction in the mother only
B) nondisjunction in the father only
C) duplication of the chromosome
D) nondisjunction or translocation in either parent
E) It is impossible to detect with current technology.


camila

  • Hero Member
  • *****
  • Posts: 705
Reply #1 on: Jun 22, 2013
100% it's D, don't forget to gimmi a thumbs up :D


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question

Hungry!

  • Hero Member
  • *****
  • Posts: 1,071
Reply #2 on: Aug 13, 2013
Thanks so much, you were right on.


« previous next »
 

Did you know?

The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.

Did you know?

Approximately 70% of expectant mothers report experiencing some symptoms of morning sickness during the first trimester of pregnancy.

Did you know?

Many people have small pouches in their colons that bulge outward through weak spots. Each pouch is called a diverticulum. About 10% of Americans older than age 40 years have diverticulosis, which, when the pouches become infected or inflamed, is called diverticulitis. The main cause of diverticular disease is a low-fiber diet.

Did you know?

Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.

Did you know?

About 100 new prescription or over-the-counter drugs come into the U.S. market every year.

(a) The Dmanisi cranium (right) shows similarities to early African H. erectus including the Narioko (a) The Dmanisi cranium (right) shows similarities to early African H. erectus including the Narioko
Electrophoresis gel in a densitometer. (a) The green light from the slit light source is visible ... Electrophoresis gel in a densitometer. (a) The green light from the slit light source is visible ...
Because vitamin A is stored in the liver, chicken liver is a potent source of this vitamin Because vitamin A is stored in the liver, chicken liver is a potent source of this vitamin
Nuts are also a good source of dietary fibre Nuts are also a good source of dietary fibre
Opener A human X chromosome highlighted using fluorescence in situ hybridization Opener A human X chromosome highlighted using fluorescence in situ hybridization
Partial map of disease genes on human chromosome 21 Partial map of disease genes on human chromosome 21
Video: Protein catabolism (Krebs cycle) and Protein anabolism (protein synthesis)

For a complete list of videos, visit our video library