Daijha Wilkes
Part 1
1. Why would a mutation leading to lactase persistence become common in a population?
a. Lactase persistence would be part of their DNA sequence. It would also be
introduced into their diet when
...
Daijha Wilkes
Part 1
1. Why would a mutation leading to lactase persistence become common in a population?
a. Lactase persistence would be part of their DNA sequence. It would also be
introduced into their diet when they are younger.
2. Use the map in Figure 1 to predict where you might find early evidence of dairying (i.e.,
using animal milk).
a. West side of Africa and Northwestern part of Europe.
3. Provide a scenario to explain how different global hot spots of lactase persistence could
be caused by the same mutation.
a. When people started to branch out and discover different parts of the world, they
took their traditions with them and introduced them to their offspring.
4. Create a scenario to explain how different global hot spots of lactase persistence could
be caused by different mutations.
a. People from Mauritania migrated towards the Sahara Desert and brought their
cattle. They continued to nurture the cattle in the same ways they did in
Mauritania.
5. Design an experiment to determine whether lactase persistence in the different global
hot spots was caused by one or several mutations.
a. Take a sample of 15 from Arizona and another sample of 15 from Iceland and
look at any mutations.
Part 2
1. In column 1, the red band represents the lactase-persistence mutation. Why is it more
prevalent in column 2, which shows the same DNA region in the same population after
many generations?
a. The gene is dominant and appears more as generations arise as a way of
adapting.
b. Mutation increases the fitness and it increases the frequency.
2. In column 2, why do the orange and yellow bands always border the red band? What do
the orange and yellow bands represent?
a. The are neutral markers that are swept along with the beneficial allele which
happens to be the red allele.
3. How many individuals in column 2 are homozygous for the lactase-persistence allele?
How many are homozygous for the surrounding region (i.e., the white rectangle)?
a. 3
b. 2
4. Why would scientists want to identify regions in the genome that are homozygous in
many individuals in a population (i.e., regions of homozygosity, or reduced diversity)?
a. In order to obtain information about how said genome affects people and the
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