Question

In: Biology

1. Fertilization typically takes place in the Fallopian tube. True or false 2. Fraternal twins result...

1. Fertilization typically takes place in the Fallopian tube.

True or false

2. Fraternal twins result when a single fertilizted egg splits in two.

True or false

3. Where is the site of early blood cell formation in human embryos?

A. Placenta

B. Bone marrow

C. Extraembryonic membranes

D. Yolk sac

4. Which of the following has the ability to cross from maternal blood to fetal blood?

A. All of the above

B. Drugs

C. Alcohol

D.oxygen

E. Caffeine

5. Which of the following structures are involved in diverting blood away from the lungs in a fetus?

A. Ductus venosus

B. Ductus arteriosus

C. Umblilical arteries

D. Foramen ovale

E. Umbilical vein

Expert Solution

Q.1 – True.

Sperm and Ovum fertilize at fallopian tube. Fertilized egg then moves towards the uterus.

Q.2 – False.

Monozygotic twins are formed when a single fertilized egg splits into two. They are also known as identical twins.

Dizygotic twins are formed when two ovum are fertilized by two sperm. They are also known as fraternal twins.

Q.3 – Yolk sac.

Yolk sac is the primary site of early blood cell formation in human embryos. Then later during the embryonic development liver becomes the primary production site. Later on Bone marrow becomes the site of RBC production.

Q.4 – All the above.

Nutrients and oxygen are passed over by diffusion across the placenta. Hence the Drugs, Alcohol, Caffeine which when consumed by the mother, could be found at same level in the fetal blood.

Q.5 - Ductus arteriosus.

Ductus arteriosus found between pulmonary artery and aorta can direct the blood away from lungs.

gladiator answered 2 years ago

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