« previous next »

Author Question: A reproductive difference between sea urchins and humans is A) the sea urchin eg (Read 757 times)

sammy

  • Hero Member
  • *****
  • Posts: 818
on: Oct 2, 2013
A reproductive difference between sea urchins and humans is
A) the sea urchin egg completes meiosis prior to fertilization, but meiosis in humans is completed after fertilization.
B) sea urchin eggs are produced by meiosis, but human eggs are produced by mitosis.
C) sea urchin eggs and sperm are of equal size, but human eggs are much bigger than human sperm.
D) sea urchins, but not humans, have a need to block polyspermy because only in sea urchins can there be more than one source of sperm to fertilize the eggs.
E) sea urchin zygotes get their mitochondria from the sperm but human zygotes get their mitochondria from the egg.


Yolanda

  • Hero Member
  • *****
  • Posts: 757
Reply #1 on: Oct 7, 2013

For sure it has to be A Mark as solved once you're done!


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

There are actually 60 minerals, 16 vitamins, 12 essential amino acids, and three essential fatty acids that your body needs every day.

Did you know?

A good example of polar molecules can be understood when trying to make a cake. If water and oil are required, they will not mix together. If you put them into a measuring cup, the oil will rise to the top while the water remains on the bottom.

Did you know?

The average office desk has 400 times more bacteria on it than a toilet.

Did you know?

As many as 28% of hospitalized patients requiring mechanical ventilators to help them breathe (for more than 48 hours) will develop ventilator-associated pneumonia. Current therapy involves intravenous antibiotics, but new antibiotics that can be inhaled (and more directly treat the infection) are being developed.

Did you know?

Despite claims by manufacturers, the supplement known as Ginkgo biloba was shown in a study of more than 3,000 participants to be ineffective in reducing development of dementia and Alzheimer’s disease in older people.

Prenatal development in humans. Prenatal development in humans.
Sagittal section of the female pelvis, showing organs of the reproductive system. Sagittal section of the female pelvis, showing organs of the reproductive system.
Difference spectra of mitochondria Difference spectra of mitochondria
The normal food link between sea urchins and algae/ Corals The normal food link between sea urchins and algae/ Corals
Autonomic innervation of the female reproductive system Autonomic innervation of the female reproductive system
Female Reproductive System - Secondary follicle Female Reproductive System - Secondary follicle
Video: Hip Animation

For a complete list of videos, visit our video library