Explain how the bone patterns in mammalian limbs came about, using the theory of evolution from a common ancestor.
Answers
Limbs are homologous structures that are repeated serially.The future hind limb was developed by the ancient duplication events ,the anatomical structure of the pectoral appendages and the genetic architecture has been replicated by the future hind limb which is responsible for the advancement of induction, patterning and growth.This mutual base of the limbs has crucial consequences for their evolution.Quantitative genetics theory conclude that genetic predictions has caused limbs to evolve in parallel exclusively between stylopod, zeugopod and autopod which are homologous segments.This genetic assimilation, which is echoed in markings of phenotypic coverings clout the variation that is applicable to draft and thus the absolute immovability of limbs.All the four phyla amphibians, reptiles birds and mammals are pentadactyl .The presence of pentadactyl limb explains the inheritance of this trait from a common ancestor with progressive modifications during the course of evolution.
The patterns of bone in the limbs of mammals can be further traced to the bone structure of the Xenarthra species as far as its histology is taken into consideration.
Explanation:
- There has been a "bone compactness" that showing pattern in the area of femur between the "species of Cingulata and Pilosa".
- Limbs are "homologous structures" that are repeated serially.
- The genetic architecture has been repeated by and hereafter hind limb which is taken care for the accountability of induction, patterning and development.
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