EVOLUTION
THE ORIGIN OF LIFE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The organism has the genetic potential to have a relatively complex anatomy.
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The organism must have multiple paired appendages along the length of its body.
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Most of its Hox genes owe their existence to gene fusion events.
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Its Hox genes cooperate to bring about sexual maturity at the proper stage of development.
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Detailed explanation-1: -Hox Genes. Hox genes are members of the homeotic transcription factor family that play a key role in controlling the body plan along the cranio-caudal axis (also referred to as anterior–posterior), and specify segment identity of tissues within the embryo.
Detailed explanation-2: -Hox genes are found in many animals, including fruit flies, mice, and humans. Mutations in human Hox genes can cause genetic disorders.
Detailed explanation-3: -Hox genes play many more roles in vertebrate development. They help specify the difference between an arm and a leg, as well as a pinky and a thumb. In the nervous system, their expression in segmented embryonic structures called rhombomeres directs the development of different brain regions.
Detailed explanation-4: -Hox genes are the master regulators of embryonic development for all animals, including humans, flies and worms. They decide what body parts go where. Not surprisingly, if something goes wrong with these genes, the results can be disastrous.