Across
- 1. group of organisms that can interbreed to produce fertile offspring under natural conditions
- 3. keeping interbreeding groups apart by some barrier or mechanism
- 8. selective breeding in which closely related individuals are allowed to breed
- 13. the study of the embryos of different species
- 14. the environmental factor that acts on the population during natural selection
- 16. the process by which one species splits into two or more separate species
- 17. the number and range of different species that exist on Earth or in an ecosystem
- 19. selection the process by which people choose to breed particular organisms with desirable features; also known as selective breeding or directed selection
- 20. the process where an environmental factor acts on a population and results in some organisms having more offspring than others
Down
- 2. change in the characteristics of a species over many generations
- 4. chemicals made by organisms such as fungi to defend them against bacteria
- 5. a special case of natural selection where the environmental factor is the selection of a mate
- 6. selective breeding by combining a desirable feature of one individual with another in the offspring
- 7. structures that are controlled by some of the same inherited genes
- 9. a map of all the places where a species occurs
- 10. fossils that have features of two or more different groups
- 11. differences in characteristics due to different genes
- 12. the time between the birth of an individual and when they produce their own offspring
- 15. inherited ability of a species to withstand chemicals such as pesticides
- 18. structures that appear similar or have the same function but are controlled by different genes