Statistics of modification and mutational variation
Answers are for parents and teachers.
1
Bean seed length (mm): 8 — 1 seed, 9 — 3, 10 — 4, 11 — 3, 12 — 1 (n = 12). Find the mean length.
10
2
Compare modification and mutation (3 differences).
Modification: not inherited, genotype unchanged, depends on environment; mutation: inherited, genotype changed, appears suddenly.
3
The basic set of watermelon is 11 chromosomes. How many chromosomes in the triploid form?
33
4
Why are most mutations harmful or neutral but important for evolution?
A random change often disturbs an ordered system; but when the environment changes, some become beneficial and give material for selection.
5
Why should skin be protected from long exposure to the sun?
Ultraviolet light can cause DNA mutations in cells.