selection for tuskless elephants worksheet answers

For example, they've been fully protected from hunting since 1954, while tusklessness has continued to increase. People hunt elephants for their tusks (ivory is very valuable). video and answer the following questions. “People shot elephants for food.

Why is the number of elephants born in Uganda without tusks increasing?

Whitehouse began by looking at the history of the Addo elephants. It would be interesting to hear your comments on the reason why this occurs in huge population and in a very large area. elephants are born without tusks and their tusks never develop as adults. 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.

Whitehouse comments that the tusked/tuskless state is likely to be sex-linked, given the strong difference between the sexes. The second possibility is also related to the vegetation in the area: there could be a link between the availability of nutrients & tusk development. Poaching is selecting for tuskless elephants, which are more likely to survive, mate, and pass on their genes. So – while natural selection is an important mechanism driving genetic change in populations, it's not the Very interesting blog article. Whitehouse tested this hypothesis in the Addo elephant population – & rejected it.

a. Joyce Poole is an expert in elephant communication and behavior.

Elephant tusks are important for obtaining food and water, and essential to male elephants for competing for mates, so one might expect strong natural selection for having tusks. Watch the Selection for Tuskless Elephants video until time 1:46 and answer the following questions. Because elephants have been extensively hunted for ivory for more than 300 years, natural selection is often proposed as the underlying mechanism for an increase in the proportion of tuskless or small-tusked elephants in a population. But her comparison of tuskless trends and the hunting pressure faced by the Addo herd failed to support this hypothesis for the Addo animals.

a) Provide a plausible explanation for how the frequency of tuskless elephants could increase by a process of natural selection. a) Provide a plausible explanation for how the frequency of tuskless elephants could increase by a process of natural selection. Whitehouse notes there is evidence for this from studies of elephant populations elsewhere in Africa. 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.

This happens by natural selection.
13. However, in South Africa's Addo Elephant National Park, 98% of females are tuskless (Whitehouse, 2001).

The first relates to the vegetation of the area – it's mainly shrubs & succulent plants. In this product, you'll receive a short, 7 slide PPT to introduce key vocabulary.

5. a. (Tusklessness in populations elsewhere in Africa – generally attributed to selective hunting – had also been noted as increasing, but not to the levels observed in Addo.) But in 2000, when Whitehouse surveyed the population, female tusklessness was at 98% but all the males had tusks. When the tuskless elephant go on and reproduce, they pass the tuskless trait to their offspring

But the time for which this population has been isolated (no more than 300 years) hardly seems long enough for a lack of selection pressure to produce the observed result. Students answer questions as they watch the film to keep them on task. Natural Selection Published October 2018 www.BioInteractive.org Page 3 of 6 Activity Student Handout Video Activity 7.

(0:20) b. I hunt in Zimbabwe and particular the Zambezi Valley and Matetsi area and there is a large number of Tuskless Elephant there, we have seen only cows.

What happened in Mozambique between 1977 and 1992?

7. Among Asian elephants, for example, a long history of hunting for ivory—as well as removing tusked elephants from the wild for labor—likely helped contribute to higher tuskless … 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. What is unusual about the elephant populations found in Gorongosa now? Dr. Poole noticed a high proportion of tuskless female elephants … Elephants with large tusks are targeted by poachers, who sell the tusks on the ivory market. Selection for Tuskless Elephants.

What would probably happen to a male elephant that doesn’t have tusks?          Therefore, tusklessness in male elephants is a ___________ (rare/common) trait.8.

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