Natural Selection and Variation

2. Reproductive isolation is a form of ______ isolation.
4. Lamarck proposed that ______ characteristics were inherited.
5. This type of mutation will not be passed on to offspring.
6. This causes variation. It can be harmful, beneficial or neutral.
8. Darwin and Alfred ______ proposed similar theories
11. This isolation occurs when a population becomes divided by a physical barrier such as water, mountains, desert, etc.
14. Another name for reproductive isolation is ______ speciation.
15. This type of natural selection occurs when the environment changes.
16. What animal is used to explain Lamarck’s theory?
18. This type of natural selection occurs when the environment does not change.
20. One of Darwin’s four observations states that more offspring are produced than survive to ______.
24. ______ Selection.
26. One of Darwin’s four observations detailed that individuals within a species differ from each other.
27. Book title – 'On the Origin of ______ by means of natural selection, or the preservation of favoured races in the struggle for life'.

1. The name given to mutations that cause death
3. Struggle for ______.
7. Another name for geographical isolation is ______ speciation.
9. This type of mutation is the only type that will contribute to large scale evolution (_____ - _____).
10. A species is defined as a group of interbreeding populations that are ______ isolated from other groups.
12. Charles ______ first proposed natural selection.
13. Survival of the ______.
14. Genetic ______ brings together new combinations of genes
17. This type of natural selection occurs when selective pressures favour the two extremes of a characteristic.
19. The development of a new species.
21. Variation is the differences in ______ of genes.
22. One of Darwin’s four observations stated that characteristics are ______.
23. Gene _____ is the movement of genes from one population to another.
25. One of Darwin’s four observations states that populations are fairly ______ in size.