selection for tuskless elephants worksheet answers

Selection for Tuskless Elephants.

Circle the letter of the best answer for each question. The second possibility is also related to the vegetation in the area: there could be a link between the availability of nutrients & tusk development. The largest remaining population, of around 130 animals, was in Eastern Cape Province. What is unusual about the elephant populations found in Gorongosa now? But as Whitehouse comments,  The third option is the result of natural selection (selective hunting). As a result, fewer of the elephants that have tusks survive to reproduce, and more of the tuskless elephants survive. Dr. Poole noticed a high proportion of tuskless female elephants … In Gorongosa National Park, Poole found that among the older female elephants that survived a period of heavy poaching in the park, over 50% are tuskless.

Poaching is selecting for tuskless elephants, which are more likely to survive, mate, and pass on their genes. By 1931 only 11 elephants remained in the Province, and the Addo park was created in an attempt to preserve that population. This was further reduced during 1919-20 by a professional hunter, who'd been contracted to kill the animals by local farmers. elephants are born without tusks and their tusks never develop as adults. Students read about how elephant populations declined over a century due to the ivory trade and how international laws attempt to protect elephants. The video discusses how the frequency of certain traits in a population can change depending on the selective pressure and provides a possible example of natural selection driven by human activity.Africa, adaptation, Gorongosa, microevolution, scientific methodology, scientific process, selective pressure, traitThis resource complies with accessibility standards in accordance with the final rule for Section 508 of the National Rehabilitation Act.Hear how educators are using BioInteractive content in their teaching. When the tuskless elephant go on and reproduce, they pass the tuskless trait to their offspring __________9.  Tusklessness is an ________________________________ (inherited/acquired) trait. (12 pts)

About 90 percent of the elephants in the park were killed during those years. Whitehouse comments that the tusked/tuskless state is likely to be sex-linked, given the strong difference between the sexes. It affected elephant survival and reproduction. So – while natural selection is an important mechanism driving genetic change in populations, it's not the Very interesting blog article. However, there's been no immigration into the Addo herd since 1931.

But in 2000, when Whitehouse surveyed the population, female tusklessness was at 98% but all the males had tusks. Analyzing Data on Tuskless Elephants Educator Materials Answers may vary Video Activity 7 Watch the Selection for Tuskless Elephants video until time 1:46 and answer the following questions a What did Dr Joyce Poole observe about the elephant population in Gorongosa National Park in Mozambique?

video and answer the following questions.

Whitehouse tested this hypothesis in the Addo elephant population – & rejected it. Students answer questions as they watch the film to keep them on task. 13. And while the elephants were hunted between 1919 and 1954, records suggest this was not selective: the animals were generally killed to reduce their impact on farming, & not directly for their ivory. That founding population of 11 comprised 8 females & 3 males, but only one adult male (which had tusks) bred with the females. Because these are the offspring of the elephants over 20 years of age and it takes longer for natural selection to completely occur where all elephants are born tuskless. Students answer questions as they watch the film to keep them on task.

But she also notes that the actual pattern of inheritance is likely to be complex, given that there are several possible phenotypes involved (tusked, having a single tusk [right or left], and tuskless), and that the few tusked mothers in Addo tend to have tuskless calves.

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