Using Figure 2, give three conclusions you can make about the distribution of these lemur species. 1 2 3 Using all the information, suggest how speciation happened to produce two species of lemur. Suggest one precaution needed when marking the lemurs to make sure the estimate of the number of lemurs is valid. Using the information provided, calculate how many lemurs in the second sample were marked.

A-Level AQA Biology Cell Membranes & Transport: Using Figure 2, give three concl

Using Figure 2, give three conclusions you can make about the distribution of these lemur species - AQA - A-Level Biology - Question 5 - 2022 - Paper 2

Question 5

Using Figure 2, give three conclusions you can make about the distribution of these lemur species. 1 2 3 Using all the information, suggest how speciation ha... show full transcript

Worked Solution & Example Answer:Using Figure 2, give three conclusions you can make about the distribution of these lemur species - AQA - A-Level Biology - Question 5 - 2022 - Paper 2

Step 1

Using Figure 2, give three conclusions you can make about the distribution of these lemur species.

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Answer

E. rufus is primarily distributed in the northern and western regions of Madagascar.
E. rufus is found mainly above the Tsimihiry River, indicating a distinct geographic boundary impacting its distribution.
The actual distribution of both species shows that E. rufus and E. ruffoni have a limited overlap in their habitats, suggesting environmental or ecological preferences.

Step 2

Using all the information, suggest how speciation happened to produce two species of lemur.

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Answer

Speciation likely occurred due to geographical isolation, as the Tsimihiry River acts as a barrier separating the two populations. This isolation would prevent gene flow between the groups, allowing for different selection pressures to affect them. Over time, variations within these isolated groups could lead to the accumulation of differences in their genetic makeup due to mutations. Eventually, these changes might result in the two populations developing into distinct species that can no longer interbreed, thus establishing E. rufus and E. ruffoni as separate species.

Step 3

Suggest one precaution needed when marking the lemurs to make sure the estimate of the number of lemurs is valid.

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Answer

Ensure that the marking process does not affect the survival or behavior of the lemurs, as this could lead to inaccuracies in the population estimate.

Step 4

Using the information provided, calculate how many lemurs in the second sample were marked.

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Answer

To find the number of marked lemurs in the second sample, use the capture-recapture method. If 30 lemurs were marked originally and then a second sample of 25 was captured, which is part of a total of 250 lemurs, the equation is:

$ext{Total marked} = 30$ $ext{Total captured in second sample} = 25$ $ext{Total population} = 250$

Thus, the proportion of originally marked lemurs to the total population is: $rac{30}{250} = x/25$ .

Solving this gives: $x = rac{30 imes 25}{250} = 3$ .

Therefore, 3 lemurs in the second sample were marked.

Using Figure 2, give three conclusions you can make about the distribution of these lemur species - AQA - A-Level Biology - Question 5 - 2022 - Paper 2

Worked Solution & Example Answer:Using Figure 2, give three conclusions you can make about the distribution of these lemur species - AQA - A-Level Biology - Question 5 - 2022 - Paper 2

Using Figure 2, give three conclusions you can make about the distribution of these lemur species.

Using all the information, suggest how speciation happened to produce two species of lemur.

Suggest one precaution needed when marking the lemurs to make sure the estimate of the number of lemurs is valid.

Using the information provided, calculate how many lemurs in the second sample were marked.

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