Download Biology 9: Unit 4 Data Analysis Name: Block: _____ 1. PanI is a

Biology 9: Unit 4 Data Analysis
1.
Name: _________________________ Block: _____
PanI is a gene in cod fish that codes for an integral membrane protein called pantophysin. Two alleles of the gene,
A
B
PanI and PanI , code for versions of pantophysin, that differ by four amino acids in one region of the protein.
Samples of cod fish were collected from 23 locations in the north Atlantic and were tested to find the proportions of
A
B
PanI and PanI alleles in each population. The results are shown in pie charts, numbered 1–23, on the map below.
The proportions of alleles in a population are called the allele frequencies. The frequency of an allele can vary from
A
0.0 to 1.0. The light grey sectors of the pie charts show the allele frequency of PanI and the black sectors show the
B
allele frequency of PanI .
(a)
(i)
B
State the two populations with the highest PanI allele frequencies.
...........................................................................................................................
(ii)
State the population in which the allele frequencies were closest to 0.5.
...........................................................................................................................
(2)
The graphs below show the latitude and the mean surface sea temperature in June of the sampling locations and the
A
frequency of the PanI allele.
IB Questionbank Biology
1
(c)
State the relationship between
(i)
A
latitude and the frequency of the PanI allele.
...........................................................................................................................
(1)
(ii)
A
mean surface sea temperature in June and the frequency of the PanI allele.
...........................................................................................................................
(1)
2.
The unicellular green alga Phaeodactylum tricornutum is photosynthetic. Cell biologists genetically modified this
organism by adding a glucose transporter gene. The modified and unmodified algae were grown in a nutrient medium
under a series of different conditions and the growth rate of the cells was measured.
12
10
Unmodified algae
Key:
= light and no glucose
in the medium
Modified algae
8
Cell density /
10 7 cells cm –3 6
= light and glucose
in the medium
4
= dark and glucose
in the medium
2
0
0
(a)
2
4
6
8 0
2
Time / days
4
6
8
State the role of glucose in the metabolism of cells.
.....................................................................................................................................
(1)
(b)
Compare the effect of light on the modified and the unmodified cells.
.....................................................................................................................................
.....................................................................................................................................
.....................................................................................................................................
.....................................................................................................................................
(2)
IB Questionbank Biology
2