Another study in 1995 shows the population of Ruiez fruit bat to be 380 bats. Bl

Question

Another study in 1995 shows the population of Ruiez fruit bat to be 380 bats. Blood samples show the REU33 gene to be recessive (p), thus bats with p'p' have the ability to feed on nectar, Pp' and PP individuals never feed on nectar as they cannot digest the sugars. 250 bats show nectar feeding, 130 were observed to never feed on nectar. It was also found that Pp' individuals show a distinct webbing of skin on their back legs (50 of the bats showed this trait). B) What is the genotypic frequency of REU33 homozygous recessives in this population? What is the allele frequency of the REU33 gene in this population? C) It looks like evolution has occurred in this population in comparison to the White-faced bats (their ancestor), why?

Explanation / Answer

Answer:

Data Given:

Nectar Feeding: pp=250

Non-Nectar Feeding: PP+Pp=130

Webbed bats: Pp=50

Total Population Size: 380

Case 1: Calculation of genotype frequency of REU33 homozygous recessive:

The genotype frequency can be calculated by simply dividing the number of individuals of a particular genotype to total population size:

Genotype Frequency of REU33 homozygous recessive (pp): 250/380= 0.65

Genotype Frequency of REU33 heterozygous (Pp): 50/380= 0.13

Case 2: Calculation of allelic frequency of the REU33 gene:

The allelic frequency can be calculated by adding the genotype frequency of that particular allele:

Allelic frequency of p: 0.65 + (0.65 X 0.13) = 0.73

Case 3: Evolution occurs in the population:

Yes, the present case shows the example of adaptive radiation in which several lineages arise from the single common ancestor.

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