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 72 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
Great answer, keep it coming :)

bblaney

  • Member
  • Posts: 323
Reply 3 on: Yesterday
Wow, this really help

« previous next »
 

Did you know?

The term bacteria was devised in the 19th century by German biologist Ferdinand Cohn. He based it on the Greek word "bakterion" meaning a small rod or staff. Cohn is considered to be the father of modern bacteriology.

Did you know?

Essential fatty acids have been shown to be effective against ulcers, asthma, dental cavities, and skin disorders such as acne.

Did you know?

For pediatric patients, intravenous fluids are the most commonly cited products involved in medication errors that are reported to the USP.

Did you know?

For high blood pressure (hypertension), a new class of drug, called a vasopeptidase blocker (inhibitor), has been developed. It decreases blood pressure by simultaneously dilating the peripheral arteries and increasing the body's loss of salt.

Did you know?

Medications that are definitely not safe to take when breastfeeding include radioactive drugs, antimetabolites, some cancer (chemotherapy) agents, bromocriptine, ergotamine, methotrexate, and cyclosporine.

Donor DNA is transferred as a single strand Donor DNA is transferred as a single strand
Vasectomy. (a) Vas deferens is located within the spermatic cord on both sides. (b) A small incision Vasectomy. (a) Vas deferens is located within the spermatic cord on both sides. (b) A small incision
When the IQ scores of identical twins differ, behavior genetics researchers attribute these to ... When the IQ scores of identical twins differ, behavior genetics researchers attribute these to ...
Concordance Values in Monozygotic and Dizygotic Twins Concordance Values in Monozygotic and Dizygotic Twins
Concordance in MZ and DZ twins for a variety of behavioral disorders Concordance in MZ and DZ twins for a variety of behavioral disorders
The effects of a single crossover in a paracentric inversion heterozygote The effects of a single crossover in a paracentric inversion heterozygote
Video: Biological organic compounds

For a complete list of videos, visit our video library