Multiple Choice
Instead of developing a head and a tail, an abnormal Drosophila embryo develops two tails. This is most likely due to __________.
20. Development
Developmental Biology
Multiple Choice
The similarity of the homeobox in many different kinds of organisms is evidence __________.
A
of convergent evolution
B
of analogy
C
that it is not responsive to natural selection
D
of its recent origin
E
of the common ancestry of different life-forms
Verified step by step guidance1
Understand the concept of a homeobox: A homeobox is a DNA sequence found within genes that are involved in the regulation of patterns of anatomical development (morphogenesis) in animals, fungi, and plants.
Recognize the significance of the homeobox: The homeobox is highly conserved across different species, meaning that it has remained relatively unchanged throughout evolution.
Consider the implications of conservation: When a genetic sequence is conserved across diverse species, it suggests that the sequence is crucial for fundamental biological processes and has been maintained through evolutionary history.
Relate conservation to common ancestry: The presence of a similar homeobox sequence in many different organisms indicates that these organisms likely share a common ancestor. This is because such a sequence would have been inherited from a common ancestor and preserved due to its essential role.
Conclude the reasoning: The similarity of the homeobox in various organisms is evidence of the common ancestry of different life-forms, as it reflects a shared evolutionary origin rather than independent development or recent origin.
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