There are surprisingly large genetic differences between individuals from the same population; indeed, recent mitochondrial DNA evidence shows greater variation within regional populations than that shown between historical human âracesâ. What are the implications of this diversity?
There are surprisingly large genetic differences between individuals from the same population; indeed, recent mitochondrial DNA evidence shows greater variation within regional populations than that shown between historical human âracesâ. What are the implications of this diversity?
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Which of the following statements best explains the process of allopatric speciation?
| Genetic differences accumulate between populations that are isolated by a geographic barrier, eventually leading to reproductive isolation. |
| Genetic differences accumulate through recombination between populations that are interbreeding, eventually leading to reproductive isolation. |
| Genetic differences accumulate in a population through selective mate choice, leading to two groups that breed independently, causing reproductive isolation. |
| Two populations in the same geographical area accumulate genetic differences by random chance, eventually leading to reproductive isolation. |
| Genetic changes within a population as the result of genetic drift influences traits involved with mate choice, eventually leading to reproductive isolation. What is the basic difference between allopatric and sympatric modes of speciation?
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Please answer all the questions
In what way did Harlanâs theory give rise to Diamondâs theory?
| It recognized agriculture might have developed by different mechanisms in different parts of the world. |
| Both make the assumption that hunter-gatherers were (and still are) superior to agriculturists. |
| It recognized the reason agriculture did not develop in certain parts of the world was because people lacked the intelligence or skill. |
| It is a basic case of scientific plagiarism - Diamonds theory is identical to Harlans theory. |
| It recognized that agricultural societies were healthier and better fed than hunter-gatherer societies. |
If a plant can grow well all by itself in the wild, yet still retains desirable agronomic traits, the plant is ____________________.
Choose the single best answer
The inability of plants to move makes it difficult for them to:
| Disperse seeds, defend themselves, and create oxygen. |
| Disperse seeds. |
| Disperse seeds and defend themselves. |
| Create oxygen. |
| Defend themselves. |
Vavilov hypothesized that in a crop plant's area of origin we should expect:
| Greater diversity for trans-domesticated species, but lower diversity for species domesticated in their area of origin. |
| Greater genetic diversity than in areas outside of the plant's area of origin. |
| Lower genetic diversity than in areas outside of the plant's area of origin. |
| Lower diversity for trans-domesticated species, but greater diversity for species domesticated in their area of origin. |
| Greater herbivore damage because of increased genetic diversity. |
Brussel sprouts, cabbage, broccoli and cauliflower are all different varieties of the same species, Brassica oleracea. This group of plants demonstrates that crop breeding can lead to:
| Low within variety and high between variety diversity |
| High within variety and low between variety diversity |
| Low within variety diversity |
| High within variety and high between variety diversity |
| High between variety diversity |
______________________ compounds are produced by plants, but are not necessary for the plant's immediate survival. However, they often help protect plants from being eaten.
In discussing the origin of agriculture, the term demographic stress refers to:
| Lower productivity of un-cultivated plants due to late-Pleistocene cooling. |
| A higher incidence of religious practice in societies following the transition from hunting and gathering to agriculture. |
| The situation where human populations are greater than the carrying capacity of the environment. |
| Hobbes's assertion that hunter-gatherer groups did not posses the knowledge or skills to develop agriculture. |
| That the stresses on pre-domesticated plant species led to the development of traits that result in the "domestication syndromeâ |
