AGRI10051 Chap.3 Artificial Selection and the Domestication of Crops and Farm Animals
Artificial Selection and the Domestication of Crops and Farm Animals
See domestication as evolution under repeated human choice, not as a single event or a list of familiar traits. This chapter connects ancestral variation, selection differentials, breeding objectives and correlated responses to explain how crops and farm animals change across generations.
You will also learn to state the trade-offs and diversity costs that make ‘improved’ meaningful only for a defined production environment.
What this chapter covers
- 01
Domestication is evolution under repeated human choice: use the chapter explanation to connect mechanism, model, evidence and limitation.
- 02
Domestication is repeated choice: use the chapter explanation to connect mechanism, model, evidence and limitation.
- 03
Why traits change as a package: use the chapter explanation to connect mechanism, model, evidence and limitation.
- 04
Direct and indirect routes: use the chapter explanation to connect mechanism, model, evidence and limitation.
- 05
Standing variation versus new mutation: use the chapter explanation to connect mechanism, model, evidence and limitation.
- 06
Define the response system: use the chapter explanation to connect mechanism, model, evidence and limitation.
- 07
A trait goal must become a measurable selection rule: use the chapter explanation to connect mechanism, model, evidence and limitation.
- 08
Single-trait selection: use the chapter explanation to connect mechanism, model, evidence and limitation.
Domestication is evolution under repeated human choice
- +1EX 3.1 Predict one generation of response Scenario. Mean grain protein is 11.0%. Plants retained as parents average 12.5%, so S = 1.5 percentage points.
- +2Narrow-sense heritability is estimated as 0.40. Expected response is R = h²S = 0.40 × 1.5 = 0.60 percentage points . The predicted offspring mean is 11.0 + 0.60 = 11.6% .
- +3Do not add the full parental advantage: only the additive heritable fraction is expected to carry into the population mean. The result is a population expectation, not a promise for each offspring. It also assumes the estimate and production environment remain relevant; genotype-by-environment interaction or correlated selection can change the realised outcome.
- +4State the genetic model and assumptions, show the working in labelled stages, and finish with a qualified biological interpretation.
Key terms
- artificial selection
- A change in reproductive contribution caused by people choosing which individuals supply the next generation.
- Model solution
- A key chapter term that must be defined in relation to the stated genetic model and evidence.
- ancestral variation
- Heritable differences already present before sustained human selection begins; these variants can respond immediately when reproductive contribution changes.
- Name the human filter
- A key chapter term that must be defined in relation to the stated genetic model and evidence.
- Explain inheritance
- A key chapter term that must be defined in relation to the stated genetic model and evidence.
- Track frequency change
- A key chapter term that must be defined in relation to the stated genetic model and evidence.
- Identify the syndrome and trade-offs
- Identify the syndrome and trade-offs.
Artificial Selection and the Domestication of Crops and Farm Animals FAQ
What is the central reasoning task in Artificial Selection and the Domestication of Crops and Farm Animals?
See domestication as evolution under repeated human choice, not as a single event or a list of familiar traits. This chapter connects ancestral variation, selection differentials, breeding objectives and correlated responses to explain how crops and farm animals change across generations. You will also learn to state the trade-offs and diversity costs that make ‘improved’ meaningful only for a defined production environment.
Which mistake should I actively check for?
The mechanism is not separate from evolution: heritable variants become more or less common because some parents contribute more descendants. Domestication syndrome i Domesticated does not mean improved in every environment Reduced seed dispersal can be valuable at harvest yet harmful to a plant reproducing without people.
Artificial selection in one line Domestication is repeated choice Domestication is not one mutation or one human decision. A domestication syndrome therefore does not prove that one gene controls every component. Do not assume every component was consciously chosen. Selection changes their frequency quickly because it does not wait for a new mutation. Avoid intention language A syndrome need not be a planned blueprint.
How much working should a genetics answer show?
EX 3.1 Predict one generation of response Scenario. Mean grain protein is 11.0%. Plants retained as parents average 12.5%, so S = 1.5 percentage points. Narrow-sense heritability is estimated as 0.40. Expected response is R = h²S = 0.40 × 1.5 = 0.60 percentage points . The predicted offspring mean is 11.0 + 0.60 = 11.6% .
Do not add the full parental advantage: only the additive heritable fraction is expected to carry into the population mean. The result is a population expectation, not a promise for each offspring. It also assumes the estimate and production environment remain relevant; genotype-by-environment interaction or correlated selection can change the realised outcome.
How should I revise this chapter?
Rebuild one diagram or cross without notes, solve the worked example with changed labels and numbers, then explain the conclusion aloud. Record the first incorrect line as a model, representation, operation or interpretation error. Return two days later and repeat a fresh problem so delayed reconstruction, rather than immediate recognition, is doing the work.
Exam move
Study Artificial Selection and the Domestication of Crops and Farm Animals as a decision sequence. Start with these navigation points: Domestication is evolution under repeated human choice; Domestication is repeated choice; Why traits change as a package; Direct and indirect routes; Standing variation versus new mutation.
For each, write the biological mechanism, the model assumptions, a predicted observation and one limitation. Cover the chapter answer and reconstruct its symbols and arithmetic. Change one premise—phase, dominance, sample size, environment or population—and predict which lines must change before recalculating.
Use the glossary for active recall, not copying: define each term, contrast it with its nearest neighbour and give one observation that discriminates them. Finish with a timed explanation that shows setup, working and a qualified conclusion. Revisit the first error after a delay and solve a new version rather than memorising the displayed numbers.
Working through Artificial Selection and the Domestication of Crops and Farm Animals in AGRI10051? Sia is AskSia’s AI Science tutor — ask any AGRI10051 Artificial Selection and the Domestication of Crops and Farm Animals question and get a clear, step-by-step explanation grounded in how AGRI10051 is taught and assessed. Read this chapter free, then take your hardest questions to Sia.
