GENETICS AND EVOLUTION
EVOLUTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A scientist produced a lamb from a frozen cell of another adult sheep.
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A scientist maintains a group of retriever dogs by only mating retriever dogs together.
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A scientist produces a bacteria that can make human insulin.
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A scientist changed the genetic make-up of a human’s white blood cells to ensure they were healthy.
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Detailed explanation-1: -The meats sold today are the result of the selective breeding of chickens, cattle, sheep, and pigs. Many fruits and vegetables have been improved or even created through artificial selection. For example, broccoli, cauliflower, and cabbage were all derived from the wild mustard plant through selective breeding.
Detailed explanation-2: -Selective breeding of the disproportionately short legs of breeds such as the Basset Hound and the Dachshund has led to bowed legs and chronic problems with elbow dislocation; the short legs and long back of Dachshunds causes them to suffer more often from ruptured vertebral disks.
Detailed explanation-3: -Additionally, most, if not all, breeds of household dogs that exist today are a result of selective breeding – this is when humans actively choose which traits should be passed onto canine offspring.
Detailed explanation-4: -Selective breeding Most dog breeds were originally selected for particular purposes, such as hunting or guarding property. Humans selectively bred dogs that were best suited for the various roles required of them, based on their fitness, ability and utility.