This topic contains a solution. Click here to go to the answer

Author Question: Dizygotic twins develop from: a. a single fertilized ovum and are always of the same sex. b. a ... (Read 44 times)

james9437

  • Hero Member
  • *****
  • Posts: 568
Dizygotic twins develop from:
 
  a. a single fertilized ovum and are always of the same sex.
  b. a single fertilized ovum and may be the same sex or different sexes.
  c. two fertilized ova and are the same sex.
  d. two fertilized ova and may be the same sex or different sexes.

Question 2

The placenta allows exchange of oxygen, nutrients, and waste products between the mother and fetus through:
 
  a. contact between maternal blood and fetal capillaries within the chorionic villi.
  b. interaction of maternal and fetal pH levels within the endometrial vessels.
  c. a mixture of maternal and fetal blood within the intervillous spaces.
  d. passive diffusion of maternal carbon dioxide and oxygen into the fetal capillaries.



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

bpool94

  • Sr. Member
  • ****
  • Posts: 354
Answer to Question 1

D
Dizygotic twins are two different zygotes, each conceived from a single ovum and a single sperm. They may be both male, both female, or one male and one female.

Answer to Question 2

A
Fetal capillaries within the chorionic villi are bathed with oxygen and nutrient-rich maternal blood within the intervillous spaces.




james9437

  • Member
  • Posts: 568
Reply 2 on: Jun 27, 2018
Excellent


Jossy

  • Member
  • Posts: 336
Reply 3 on: Yesterday
Thanks for the timely response, appreciate it

 

Did you know?

Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.

Did you know?

Your chance of developing a kidney stone is 1 in 10. In recent years, approximately 3.7 million people in the United States were diagnosed with a kidney disease.

Did you know?

In 1885, the Lloyd Manufacturing Company of Albany, New York, promoted and sold "Cocaine Toothache Drops" at 15 cents per bottle! In 1914, the Harrison Narcotic Act brought the sale and distribution of this drug under federal control.

Did you know?

There are 60,000 miles of blood vessels in every adult human.

Did you know?

The longest a person has survived after a heart transplant is 24 years.

For a complete list of videos, visit our video library