1. Why do some stickleback populations lack pelvic spines?from the following vid
ID: 162381 • Letter: 1
Question
1. Why do some stickleback populations lack pelvic spines?from the following video http://mediaplayer.pearsoncmg.com/assets/gHqRu3vsDgipqyDIwQQlJ9DH5u5nGaef
Select all that apply.
Pelvic spines are homologous to legs in four-legged animals and freshwater sticklebacks don’t need hind limbs to move.
2. What did researchers discover about the genetic mutation causing the loss of pelvic spines?
Select all that apply.
Freshwater fish have evolved different types of protective armor to keep them safe from predators. In freshwater, a marine stickleback sheds its spines. In lakes where there are no large predatory fish, there is no advantage to having pelvic spines. In lakes with dragonfly larvae, pelvic spines can be disadvantageous, allowing the predatory larvae to grab the fish.Pelvic spines are homologous to legs in four-legged animals and freshwater sticklebacks don’t need hind limbs to move.
2. What did researchers discover about the genetic mutation causing the loss of pelvic spines?
Select all that apply.
It results in a protein that is no longer functional. It is found in the coding region of the Pitx1 gene. It is found in a regulatory region (a “switch”) upstream of the coding region of the Pitx1 gene. It occurred in a similar DNA region in freshwater stickleback populations all over the world.Explanation / Answer
1.The correct answers are:
In lakes with dragonfly larvae, pelvic spines can be disadvantageous, allowing the predatory larvae to grab the fish.
Pelvic spines are homologous to legs in four-legged animals and freshwater sticklebacks don’t need hind limbs to move.
2.The correct answers are:
It is found in a regulatory region (a “switch”) upstream of the coding region of the Pitx1 gene.
It occurred in a similar DNA region in freshwater stickleback populations all over the world.
Explanation:The above answers are as per the video.
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