Thekey differencebetween allometric and isometric growth is thatallometric growth refers to the unequal growth rate in different parts of the body in comparison to the growth rate of the body as a whole while isometric growth refers to the equal growth rate of body parts in comparison to the growth rate of the body as a whole.
Allometric growth and isometric growth are two types of relationships between the growth rates of different body parts in comparison to the growth rate of the whole body. In allometric growth, the growth rates of different body parts differ from that of the whole body. In contrast, in isometric growth, body parts grow at the same rate as the rest of the body. In short, the growth rate is unequal in allometric growth while it is equal in isometric growth.
CONTENTS
1.Overview and Key Difference
2.What is Allometric Growth
3.What is Isometric Growth
4.异量级和等距生长之间的相似性
5.Side by Side Comparison – Allometric vs Isometric Growth in Tabular Form
6.概括
What is Allometric Growth?
异态是对生物特征如何随大小变化的研究。简而言之,这是对身体部位的大小与整个身体大小之间的关系的研究。相对于人体的整个人体的生长速度相比,异形生长是指身体不同部位的不等增长率。当特定身体部位或结构的生长不断显示出比整个身体的生长速度不断更高的速度时,就会发生这种情况。因此,异形特征的增长速度与整个身体不同。
For example, the growth of the brain shows an allometric growth compared to body size. Another example is the growth of chela (claw) of the male fiddler crab. Chela is growing at a faster rate than the rest of the body. Hence, male fiddler crab has a giant claw while the other is in normal size. This giant claw helps them to attract females and fight with males. Moreover, theskeleton的mammalsshows allometric growth.
What is Isometric Growth?
Isometric growth refers to the equal growth of all body parts. In other words, the growth rates of different body parts show a similar rate with the growth rate of the whole body. Therefore, the organs grow at the same rate as the rest of the body. They maintain a constant proportionate size throughout their development. Therefore, the adult proportions are not significantly different from those of the juvenile. For example, the growth rate of our heart is more or less isometric. Moreover,salamanders属于属Batrachosepsshow an isometric growth.
What are the Similarities Between Allometric and Isometric Growth?
- Allometric growth and isometric growth are two types of relationships between the growth rates of different body parts in relation to the growth rate of the body as a whole.
- Living organisms show both types of growth during their development.
What is the Difference Between Allometric and Isometric Growth?
身体部位的生长速率与整个身体的增长率不同。相比之下,身体部位与等距生长的整个身体的生长速度相似。因此,这是异轴和等距生长之间的关键区别。考虑到一些例子,男性提琴手蟹的人类生长和爪生长是同异化生长的两个例子,而人心脏和sal的生长的生长是等距生长的两个例子。
Below infographic summarizes the difference between allometric and isometric growth.
摘要 - 异形与等距生长
In allometric growth, different organs or structures grow in different rates in comparison to the growth rate of the whole body. In isometric growth, organs grow at the same rate as the body growth. So, this is the key difference between allometric and isometric growth. Human growth is an example of allometric growth while salamander growth is an example of isometric growth.
Reference:
1. “Allometry: The Study of Biological Scaling” Nature News, Nature Publishing Group,Available here.
2.“时机就是一切:形态发生,异缘和进化。”异缘Available here.
Image Courtesy:
1. “West African fiddler crab (Uca tangeri) male” By Charles J Sharp – Own work, from锋利的摄影(CC BY-SA 4.0)viaCommons Wikimedia
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