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alexdok
4 days ago
8

Researchers believe that in a fish species, individuals with the recessive genotype aa are predisposed to disease. Homozygous do

minant (AA) individuals and heterozygous (Aa) individuals are not believed to be susceptible to this disease. A pond was stocked with 100 fish of the AA genotype and 100 fish of the aa phenotype, and the fish were allowed to breed. In the next generation, 35 percent of the fish had the dominant (AA) phenotype. What does this result indicate?
Biology
1 answer:
-BARSIC- [2.5K]4 days ago
7 0

Response:

The frequency of the homozygous dominant phenotype is above what was anticipated, suggesting that evolution has taken place.

Clarification:

Initially, the pond contains 200 fish, with 100 being AA(50%) and 100 being aa(50%). Applying the Hardy-Weinberg Equilibrium formula, we can determine that the gene frequency is

A=0.5

a=0.5

According to these frequencies, the anticipated percentage of offspring with the dominant genotype would be:

AA= 0.5 * 0.5 = 0.25 = 25%

In reality, the observed homozygous dominant percentage is 35%, which is greater than expected  (25%). A higher frequency of homozygous dominant indicates that the Hardy-Weinberg Equilibrium has been disrupted. Thus, evolution likely caused the shift in gene frequency.

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