SCIENTIFIC INQUIRY INTERPRET THE DATA Researchers studied...

SCIENTIFIC INQUIRY INTERPRET THE DATA Researchers studied genetic variation in the marine mussel Mytilus edulis around Long Island, New York. They measured the frequency of a particular allele (lap ") for an enzyme involved in regulating the mussel's internal saltwater balance. The researchers presented their data as a series of pie charts linked to sampling sites within Long Island Sound, where the salinity is highly variable, and along the coast of the open ocean, where salinity is constant. (a) Create a data table for the 11 sampling sites by estimating the frequency of $l a p^{94}$ from the pie charts. (Hint: Think of each piechart as a clock face to help you estimate the proportion of the shaded area.) (b) Graph the frequencies for sites $1-8$ to show how the frequency of this allele changes with increasing salinity in Long Island Sound (from southwest to northeast). Evaluate how the data from sites $9-11$ compare with the data from the sites within the Sound. (c) Considering the various mechanisms that can alter allele frequency, construct a hypothesis that explains the patterns you observe in the data and that accounts for the following observations: $(1)$ The $\operatorname{lap}^{94}$ allele helps mussels maintain osmotic balance in water with a high salt concentration but is costly to use in less salty water; and $(2)$ mussels produce larvae that can disperse long distances before they settle on rocks and grow into adults.

SCIENTIFIC INQUIRY INTERPRET THE DATA Researchers
studied genetic variation in the marine mussel Mytilus edulis
around Long Island, New York. They measured the frequency of
a particular allele (lap ") for an enzyme involved in regulating the
mussel's internal saltwater balance. The researchers presented
their data as a series of pie charts linked to sampling sites within
Long Island Sound, where the salinity is highly variable, and
along the coast of the open ocean, where salinity is constant.
(a) Create a data table for the 11 sampling sites by estimating
the frequency of $l a p^{94}$ from the pie charts. (Hint: Think of each
piechart as a clock face to help you estimate the proportion
of the shaded area.) (b) Graph the frequencies for sites $1-8$ to
show how the frequency of this allele changes with increasing
salinity in Long Island Sound (from southwest to northeast).
Evaluate how the data from sites $9-11$ compare with the data
from the sites within the Sound. (c) Considering the various
mechanisms that can alter allele frequency, construct a
hypothesis that explains the patterns you observe in the data
and that accounts for the following observations: $(1)$ The $\operatorname{lap}^{94}$
allele helps mussels maintain osmotic balance in water with a
high salt concentration but is costly to use in less salty water;
and $(2)$ mussels produce larvae that can disperse long distances
before they settle on rocks and grow into adults.

Key Concepts

Data Visualization and Interpretation

This concept involves converting graphical representations (like pie charts) into quantitative data, which then can be organized in tables or graphs. It is essential for identifying trends, estimating measurements, and drawing conclusions from data obtained during experiments.

Graphical Representation of Relationships

Graphical representation, such as plotting allele frequencies against environmental gradients (e.g., salinity levels), allows scientists to visually analyze how variables are related. This aids in understanding patterns, making comparisons, and identifying correlations that inform further analysis.

Hypothesis Formulation

Formulating a hypothesis is a core aspect of the scientific method. It involves using observed data and known mechanisms to propose a testable explanation for a phenomenon. In this context, it includes integrating information about environmental pressures and genetic variation to explain changes in allele frequency.

Natural Selection and Adaptation

This concept describes the process by which certain traits become more prevalent in a population because they confer a survival or reproductive advantage. Variation in environmental conditions, such as differences in salinity, can exert selective pressures that favor specific genetic traits over others.

Dispersal and Gene Flow

Dispersal and gene flow involve the movement of individuals or their genetic material between populations, which can blur or modify localized effects of natural selection. This concept is important in understanding how genetically distinct populations may become connected through the movement of individuals, influencing allele frequencies across different regions.

Transcript

0:00 Okay already.

00:01 So this chapter is all about evolution of various populations, and we're looking specifically at a study that was done in the long island sound of some muscles.

00:16 So part a just wants us to condense.

00:19 What is a bunch of figures of pie charts into a graph are into, like, a data table and then into the graph.

00:30 So part is making the table on dso we have in this image in the textbook 11 sampling sites.

00:38 So, um, you know, the first column will be our sampling site number, and then the other piece of that is the illegal frequencies.

00:56 Now, since the frequency, yeah, as we're comparing the slap 94 to the others.

01:04 But it's gonna do the little frequency of the, um, a little in question.

01:12 And then, of course, you have them to that.

01:13 It won.

01:14 So by having this data, we could extrapolate the remaining amount of data.

01:21 Okay, so then the sites, we just have up to 11 of them, okay? and the idea here is that 9, 10 and 11 are basically in the ocean.

01:39 And then, um, went through eight are in this, uh, the long island sound which has a different solidity.

01:50 So i kind of cut it into eights just mentally and then estimated it that way, which closest eighth it was at.

02:01 And you might have done something a little bit more precise than that, which is also fine.

02:06 But what i did, i got 1/8 um, four sites, one through three, and it's like four would have been two eights or one quarter five, six and seven.

02:22 To me, looked like 3/8 and then eight.

02:33 Let the 2.5 or for it 9, 10 and 11 all to me like it was about five eights.

02:43 It's hopefully you know you might have.

02:45 It's a little bit cleaning with lines so you can see these better.

02:52 That's gonna be part is just making some estimates here.

02:57 And so then part b is to take that data for sites one through eight and graph.

03:05 It's so okay, so on the x axis will just put site number and the y axis will be theo leo frequency.

03:23 Okay.

03:23 And so 181 quarter, 381 half mhm and so on.

03:32 And so then that would give us.

03:38 And thats question.

03:39 He wants us to graph.

03:40 The first eight sites were only look at the ones in the long island sound.

03:43 When we do that, the first three end up being 1/8.

03:51 The fourth site gives us one quarter the 5th, 6th and 7th site 3/8 of in the eighth cycles up 2.5.

04:05 You can also certainly do like paragraphs.

04:12 If that's more your style, both would be correct.

04:16 It just asks for a graph.

04:24 Uh huh...

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