This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: Dizygotic twins develop from: a. a single fertilized ovum and are always of the same sex. b. a ... (Read 83 times)

james9437

  • Hero Member
  • *****
  • Posts: 568
on: Jun 27, 2018
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
Reply #1 on: Jun 27, 2018
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
Gracias!

AISCAMPING

  • Member
  • Posts: 347
Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

« previous next »
 

Did you know?

A strange skin disease referred to as Morgellons has occurred in the southern United States and in California. Symptoms include slowly healing sores, joint pain, persistent fatigue, and a sensation of things crawling through the skin. Another symptom is strange-looking, threadlike extrusions coming out of the skin.

Did you know?

In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.

Did you know?

Approximately one in four people diagnosed with diabetes will develop foot problems. Of these, about one-third will require lower extremity amputation.

Did you know?

GI conditions that will keep you out of the U.S. armed services include ulcers, varices, fistulas, esophagitis, gastritis, congenital abnormalities, inflammatory bowel disease, enteritis, colitis, proctitis, duodenal diverticula, malabsorption syndromes, hepatitis, cirrhosis, cysts, abscesses, pancreatitis, polyps, certain hemorrhoids, splenomegaly, hernias, recent abdominal surgery, GI bypass or stomach stapling, and artificial GI openings.

Did you know?

In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.

) A more elaborate motif, the β barrel. This β barrel is a single domain of α-hemolysin ) A more elaborate motif, the β barrel. This β barrel is a single domain of α-hemolysin
Muscle fibers consist of single, elongated, multinucleated cells that arise from the fusion Muscle fibers consist of single, elongated, multinucleated cells that arise from the fusion
Long bones develop from several bony centers--one for the shaft and at least one for each end. The e Long bones develop from several bony centers--one for the shaft and at least one for each end. The e
Withdrawing Medication from Single-Dose or Multiple-Dose Vials Withdrawing Medication from Single-Dose or Multiple-Dose Vials
Young recent immigrants often develop two identities Young recent immigrants often develop two identities
Days 24–25 Pharyngeal arches develop. They will contribute to the face, neck, larynx, and pharynx. Days 24–25 Pharyngeal arches develop. They will contribute to the face, neck, larynx, and pharynx.
Video: The pH scale - Strong acids and Weak acids

For a complete list of videos, visit our video library