selective breeding
1. modern dogs are direct descendants of the gray wolf. they first appeared about 130,000 years ago. today, there are about 150 different breeds of domestic dog, a few of which are shown below.
an image showing a gray wolf and various modern dog breeds with a note that all modern domestic dogs are descendants of the gray wolf
which process brought about by humans created the great variety of modern dogs?

2. over the past few thousand years, humans have helped to bring about changes in many plant and animal species in order to make them more useful. examples include strong workhorses, hunting dogs, large - eared corn, and beautiful flower varieties. which technique was most likely used to develop this new variety of organisms?

3. selective breeding has been used to improve the racing ability of horses.
a. define selective breeding and state how it would be used to improve the racing ability of horses.
b. state one disadvantage of selective breeding.

Question

selective breeding
1. modern dogs are direct descendants of the gray wolf. they first appeared about 130,000 years ago. today, there are about 150 different breeds of domestic dog, a few of which are shown below.
an image showing a gray wolf and various modern dog breeds with a note that all modern domestic dogs are descendants of the gray wolf
which process brought about by humans created the great variety of modern dogs?

2. over the past few thousand years, humans have helped to bring about changes in many plant and animal species in order to make them more useful. examples include strong workhorses, hunting dogs, large - eared corn, and beautiful flower varieties. which technique was most likely used to develop this new variety of organisms?

3. selective breeding has been used to improve the racing ability of horses.
   a. define selective breeding and state how it would be used to improve the racing ability of horses.
   b. state one disadvantage of selective breeding.

Accepted Answer

### Question 1
# Brief Explanations:
The problem is about the process humans used to create different dog breeds from gray wolves. Selective breeding (also called artificial selection) is when humans choose organisms with desired traits to breed, leading to offspring with those traits. Over time, this creates diverse breeds as seen in dogs.
# Answer:
The process is selective breeding (or artificial selection). Humans selected gray wolves (or early dogs) with desired traits (like size, temperament, appearance) and bred them, leading to the variety of modern dog breeds.

### Question 2
# Brief Explanations:
The examples (workhorses, hunting dogs, corn, flowers) involve humans creating new varieties by choosing organisms with useful traits to breed. This is selective breeding (artificial selection), where humans direct the breeding to get desired characteristics.
# Answer:
The technique is selective breeding (artificial selection). Humans selected plants/animals with traits like strength (horses), hunting ability (dogs), large ears (corn), or beauty (flowers) and bred them to develop new varieties.

### Question 3a
# Brief Explanations:
First, define selective breeding: humans deliberately breed organisms with desired traits to produce offspring with those traits. For horses, to improve racing ability, select horses with fast speed, good stamina, and strong build, then breed them. Their offspring inherit these traits, and over generations, racing ability improves.
# Answer:
- **Definition of selective breeding**: The process by which humans deliberately choose and breed organisms (plants or animals) with specific desirable traits to produce offspring that inherit those traits.
- **Using it for horses**: To improve racing ability, identify horses with desirable racing traits (e.g., high speed, good stamina, strong muscular structure, efficient cardiovascular system). Breed these selected horses together. Over successive generations, the offspring will inherit the desirable racing traits, and through repeated selection and breeding, the racing ability of the horse population (or breed) will be enhanced.

### Question 3b
# Brief Explanations:
One disadvantage of selective breeding is reduced genetic diversity. When breeding for specific traits, only a small subset of genes is passed on, so the population has less variation. This makes them more vulnerable to diseases, environmental changes, or new pests, as there are fewer different genes to provide resistance or adaptability.
# Answer:
One disadvantage of selective breeding is **reduced genetic diversity**. By focusing on a few desired traits, the gene pool of the population becomes limited. This makes the organisms more susceptible to diseases, pests, or environmental changes, as there is less genetic variation to provide resistance or adaptability. (Other disadvantages: increased risk of inherited disorders, longer time to produce results, etc.)

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