Selective Breeding & Genetic Diversity — Drills · Grade 7 Science
Chapter: Evolution, Evidence & Life HistoryWhat these drills covers
By the end of Selective Breeding & Genetic Diversity you should be able to:
- I can explain selective breeding & genetic diversity.
- I can use evidence, a model, and stated assumptions to support a biological explanation.
4 questions, multiple choice, numeric and written answer, each with a worked explanation.
Vocabulary used: artificial selection, selective breeding, gene pool, heritability evidence, selection pressure.
Problem 1
Which comparison better tests an inherited yield contribution?
- Parents in entirely different conditions only
- Offspring groups under matched conditions with replication
- Only the highest one result
- A label saying best
Answer and explanation
Offspring groups under matched conditions with replication
Matched offspring comparisons address environmental differences and variability.
Problem 2
A sample has 15 plants with a selected variant among 50. Find the share.
Answer and explanation
30 %
15/50×100=30%, without assuming universal advantage.
Problem 3
Does training an individual automatically count as selective breeding?
Answer and explanation
No. Selective breeding changes which organisms reproduce based on traits; training changes an individual’s experience.
Problem 4
Does improvement in one chosen trait prove improvement in every trait?
Answer and explanation
No. Other outcomes and tradeoffs need separate evidence.