1. Dogs — bred for specific traits (speed in greyhounds, herding in border collies, guiding in labradors). 2. Cattle — bred for high milk yield or increased meat production. 3. Wheat — bred for disease resistance, higher yield, and shorter stems (less likely to fall over).

Describe the process of selective breeding.

1. Choose parents that show the desired characteristic. 2. Breed them together. 3. Select offspring that best show the characteristic. 4. Repeat over many generations. Over time the desired trait becomes more common in the population.

Sample Questions

What is selective breeding?

A. The random mating of organisms in the wild
B. The process of choosing organisms with desired traits to breed together
C. The genetic modification of organisms using DNA technology
D. The natural selection of organisms by environmental pressures

1 markfoundation

Explain how selective breeding has been used to develop modern wheat varieties with higher yields.

4 marksstandard

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