Selective Breeding
What is selective breeding?
Humans choosing organisms with desired traits to reproduce
What is a desired trait?
A characteristic that someone wants an organism to have
What is livestock?
Farm animals raised for products or other agricultural purposes
What is a crop?
Plants grown for food or other useful products
A farmer chooses the largest pumpkins to produce seeds for the next generation. What process is being used?
Selective Breeding
Who chooses which organisms reproduce during selective breeding?
Humans, such as farmers or breeders
Name one trait a farmer might want in a crop.
Examples: larger fruit, more kernels, drought resistance, or disease resistance
Name two examples of livestock.
Examples: cattle, chickens, pigs, and sheep
Name one crop that humans grow for food.
Examples: corn, wheat, rice, and tomatoes
A farmer wants cows that produce more milk. What is the breeding goal?
Increase milk production
What is the main goal of selective breeding?
To increase the likelihood that desired inherited traits will appear in future generations
Name one trait a livestock farmer might want in cattle
Examples: greater milk production, faster growth, or disease resistance
A farmer breeds cows that produce more milk. What desired trait is being selected?
High milk production
A farmer selects corn plants that produce more kernels. What is the desired trait?
Producing more kernels
A farmer chooses wheat plants that survive with less water. What is the desired trait?
Drought tolerance
Does selective breeding happen randomly, or do humans choose organisms with desired traits?
Humans choose organisms with desired traits.
Why might a farmer choose animals that resist certain diseases for breeding?
To increase the likelihood that offspring inherit traits that help them resist disease
A farmer chooses sheep with thicker wool to reproduce. Why might this be useful?
Thicker wool can provide more wool for clothing and other products.
Why might farmers breed plants that can survive dry conditions?
These plants may continue growing and producing food when water is limited.
A breeder selects dogs from a population because they have a desired inherited trait. What determines whether offspring can inherit that trait?
Whether the trait is inherited and which genetic variants the offspring receive from their parents
How can selective breeding change the traits commonly found in a population over many generations?
Desired inherited traits can become more common over generations as selected organisms reproduce.
A farmer wants chickens that lay more eggs. Identify the breeding goal, the desired trait, and the reason for choosing it.
Goal: increase egg production. Trait: laying more eggs. Reason: produce more eggs for food or sale.
A farmer breeds cattle for disease resistance. Explain how this trait could benefit the farm.
Disease resistance can help animals remain healthier and may reduce illness-related losses.
A farmer wants tomatoes that resist disease and produce more fruit. Identify two desired traits and explain why they are useful.
Disease resistance and greater fruit production; both can help farmers produce healthier plants and more tomatoes.
A farmer wants chickens that lay more eggs, but also wants them to remain healthy. Identify the breeding goal, two desired traits, and one reason for selecting those traits.
Goal: improve egg production and chicken health. Traits: laying more eggs and having better disease resistance. Reason: produce more eggs while maintaining healthier chickens.