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.
Which is an example of selective breeding?
3. The text explains that selective breeding involves breeding animals or plants for specific desirable traits. For example,
humans bred different types of dogs to accomplish certain jobs
. Farmers breed chickens for having more meat and laying a greater amount of eggs.
Which animals are selectively bred and for what characteristics?
- animals that produce lots of milk or meat.
- chickens that lay large eggs.
- domestic dogs that have a gentle nature.
What was the first animal to be selectively bred?
Selective breeding was established as a scientific practice by Robert Bakewell during the British Agricultural Revolution in the 18th century. Arguably, his most important breeding program was with
sheep
. Using native stock, he was able to quickly select for large, yet fine-boned sheep, with long, lustrous wool.
What dogs have been selectively bred for?
- scent hunting: basset hound, beagle, dachshund.
- companionship: bichon frise, Boston terrier, bulldog, Cavalier King Charles spaniel, keeshond, Maltese, Yorkshire terrier.
- herding: border collie, Old English sheepdog, Welsh corgi, wheaten terrier.
What are 4 examples of selective breeding?
- cows that produce lots of milk.
- chickens that produce large eggs.
- wheat plants that produce lots of grain.
What is bad about selective breeding?
Selective breeding can result in better quality products and higher yields in plants and animals that have been bred for specific characteristics. … Disadvantages include a
reduction in genetic diversity and discomfort for animals that have very exaggerated characteristics
.
What are the three types of selective breeding?
The three methods of selective breeding are
outcrossing, inbreeding and line breeding
.
What is an example of inbreeding?
Inbreeding refers to the mating of close relatives in species that are normally outbreeding.
Matings between father and daughter, brother and sister, or first cousins
are examples of inbreeding.
What are the pros and cons of selective breeding?
Selective breeding is an
extremely efficient way to good genetics in certain crops and livestock
. However, if you are concerned about the cons of it, such as a genetic depression or discomfort to animals, the alternatives can be much worse, such as carrying out genetic modification.
When did humans start selectively breeding?
Selective breeding began
about 10,000 years ago
, after the end of the last Ice Age. Hunter-gatherers began to keep flocks and herds and to cultivate cereals and other plants.
When did humans start selectively breeding dogs?
Breeding becomes a hobby
Breeding as we know it today is a fairly recent invention. For the most part, it wasn’t until
the 19th century
that people began to keep records of canine bloodlines and to classify dogs into specific breeds rather than generic types such as hunting dog, hound, herding dog, or lap dog.
How do humans breed?
Humans mate through a
process called sexual intercourse
. Human reproduction depends on the fertilization of a woman’s ova (egg) by a man’s sperm.
Why artificial breeding is bad?
This process is
immoral as it induces fear and anxiety
in whatever animals are being subjected to a new environment. On top of this, artificial selection can have detrimental effects on these animals, such as obesity, diseases, health disorders, and can even lead to smaller brain size.
What dog breed has the most medical problems?
#1.
At the top of the list is the
friendly cocker spaniel
, which has the highest number of health concerns. While known to have a variety of orthopaedic issues, the cocker spaniel is also prone to epilepsy, heart diseases and liver disease.
What are 2 disadvantages of selectively breeding dogs?
- It can lead to loss of species variety. …
- It does not have control over genetic mutations. …
- It brings about discomfort to animals. …
- It can create offspring with different traits. …
- It could create a genetic depression. …
- It poses some environmental risks.
