Download Natural Selection and Variation

Natural Selection and Variation
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Across
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2. One of Darwin’s four observations detailed that
individuals within a species differ from each other.
4. What animal is used to explain Lamarck’s theory?
1. Book title – 'On the Origin of ______ by means of
natural selection, or the preservation of favoured races in
the struggle for life'.
5. One of Darwin’s four observations states that
populations are fairly ______ in size.
3. Another name for geographical isolation is ______
speciation.
6. Charles ______ first proposed natural selection.
4. Reproductive isolation is a form of ______ isolation.
8. Struggle for ______.
7. A species is defined as a group of interbreeding
populations that are ______ isolated from other groups.
9. Darwin and Alfred ______ proposed similar theories
10. Lamarck proposed that ______ characteristics were
inherited.
13. This type of natural selection occurs when the
environment changes.
15. This isolation occurs when a population becomes
divided by a physical barrier such as water, mountains,
desert, etc.
16. This causes variation. It can be harmful, beneficial or
neutral.
18. This type of natural selection occurs when the
environment does not change.
21. Survival of the ______.
22. Genetic ______ brings together new combinations of
genes
23. One of Darwin’s four observations states that more
offspring are produced than survive to ______.
24. One of Darwin’s four observations stated that
characteristics are ______.
26. This type of mutation will not be passed on to
offspring.
11. This type of natural selection occurs when selective
pressures favour the two extremes of a characteristic.
12. Gene _____ is the movement of genes from one
population to another.
14. The name given to mutations that cause death
17. Another name for reproductive isolation is ______
speciation.
18. The development of a new species.
19. This type of mutation is the only type that will
contribute to large scale evolution (_____ - _____).
20. Variation is the differences in ______ of genes.
25. ______ Selection.