Steps of selective breeding?
Reveal answer
Choose parents → breed → select best offspring → repeat for generations.
Key words: generations
6(b) SELECTIVE BREEDING · RECALL
6.10 Selective breeding of plants
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Other name for selective breeding?
Reveal answer
Artificial selection.
Key words: artificial
Problem with selective breeding?
Reveal answer
Less variation → vulnerable to disease.
Key words: variation
Feature bred into wheat?
Reveal answer
High yield / short stems / disease resistance.
Key words: yield
Why keep seed banks?
Reveal answer
Store alleles for future breeding.
Key words: alleles
What is meant by the term selective breeding?
Reveal answer
Humans choosing individuals with desired characteristics to breed together.
Key words: selective breeding
What is meant by the term desired characteristic?
Reveal answer
A trait chosen by the breeder because it is useful.
Key words: desired characteristic
What is meant by the term variety?
Reveal answer
A distinct type of crop plant produced by breeding.
Key words: variety
Selective breeding in crops, High yield. Example? Benefit?
Reveal answer
Example: Larger wheat grains. Benefit: More food per field.
Key words: High yield
Selective breeding in crops, Disease resistance. Example? Benefit?
Reveal answer
Example: Rust-resistant wheat. Benefit: Less crop loss and less fungicide use.
Key words: Disease resistance
Selective breeding in crops, Short stems. Example? Benefit?
Reveal answer
Example: Dwarf wheat varieties. Benefit: Less wind damage; more energy into grain.
Key words: Short stems
Selective breeding in crops, Tolerance. Example? Benefit?
Reveal answer
Example: Drought-tolerant varieties. Benefit: Crops survive in drier conditions.
Key words: Tolerance
True or false, and why? “Selective breeding creates new genes.”
Reveal answer
False. It selects from alleles already present; new alleles arise only by mutation.
True or false, and why? “One generation of breeding gives the final variety.”
Reveal answer
False. Selection is repeated over many generations.
True or false, and why? “Selective breeding is the same as genetic modification.”
Reveal answer
False. Selective breeding crosses whole organisms of the same or related species; it does not insert genes directly.