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katen-ka-za [31]
3 years ago
10

There is a population of Drosophila flies in a small fruit shop

Biology
1 answer:
Alenkasestr [34]3 years ago
3 0

<span>The answer is A. p2 = 0.36, 2pq = 0.48, q2 = 0.16.</span>

<span>
</span><span>
Let's first distinguish alleles frequencies from genotypes frequencies:
p - a frequency of R allele,
q - a frequency of r allele,
p² - a frequency of RR genotype,
2pq - a frequency of Rr genotype,
q² - a frequency of rr genotype.</span>

<span>

<span>The gene frequency of allele r changes from 0.38 to 0.40, thus:
q = 0.40</span>

Now, we will implement this in the following equation:
p + q = 1

If q = 0.40, then:
p + 0.40 = 1
</span>⇒ p = 1 - 0.40<span>
</span>⇒ p = 0.60

<span>

<span>Now, the frequencies of both alleles are know and it is easy to calculate the genotype frequencies:
- the frequency of RR genotype: p² = 0.60² = 0.36</span>
- the frequency of Rr genotype: 2pq = 2 · 0.60 · 0.40 = 0.48
- the frequency of rr genotype: q² = 0.40² = 0.16</span>

<span>

<span>Therefore, the new genotype frequencies in that population are p2 = 0.36, 2pq = 0.48, q2 = 0.16.</span></span>

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