In what ways would you expect a fetus to differ from an animal some time after birth?
Off the top of my head, it would involve at least a difference in size and muscular coordination. I assume that you are only concerned with mammals.
I hope this helps. Thanks for asking.
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Since this is not my area of expertise, I searched Google under the key words "Huntington's disease" to get these possible sources:
http://www.ninds.nih.gov/disorders/huntington/huntington.htm
http://en.wikipedia.org/wiki/Huntington's_disease
http://www.mayoclinic.com/health/huntingtons-disease/DS00401
http://www.nlm.nih.gov/medlineplus/huntingtonsdisease.html
(Broken Link Removed)
In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search.
I hope this helps. Thanks for asking.
To understand how a fetus differs from an animal after birth, we need to consider the developmental stages and processes that occur before and after birth:
1. Physical Development: One of the most noticeable differences is the transformation of the fetus into a functioning organism after birth. A fetus undergoes various growth processes during gestation, whereas an animal after birth continues to develop physically, including the growth and maturation of organs, bones, and muscles.
2. Respiratory Adaptation: In mammals, including humans, the fetal lungs are not functional inside the womb as they receive oxygen directly from the mother's bloodstream. However, after birth, the transition from the fetus to an animal involves the initiation of independent breathing. The lungs of the newborn must adapt to the extrauterine environment to facilitate adequate gas exchange.
3. Nutritional Changes: In utero, a fetus receives nourishment through the placenta from the mother's bloodstream. After birth, an animal typically transitions to breastfeeding or formula feeding, obtaining nutrients from sources external to its body. This change requires the development of a functional digestive system and the ability to process different kinds of food.
4. Sensory and Cognitive Development: A fetus gradually develops sensory organs such as eyes, ears, and taste buds, as well as basic sensory perception. After birth, an animal continues to refine its senses and cognitive abilities, exploring the world around them and developing more complex cognitive processes, learning, and memory.
5. Behavioral Adaptations: Animals demonstrate increasingly complex behaviors as they grow and interact with their environment after birth. While a fetus may display some reflexive movements and responses in the womb, animals develop a wide range of behaviors, including motor skills, social interactions, and the ability to adapt to different situations.
It is important to note that the specific differences between a fetus and an animal after birth can vary among different species, and the duration of developmental changes can differ as well. Overall, the transition from a fetus to an animal involves significant physical, physiological, and behavioral transformations to support independent existence outside the womb.