Assume that the ability or inability to fold the tongue is controlled by a singl

Question

Assume that the ability or inability to fold the tongue is controlled by a single locus with two alleles: the ability to fold the tongue is dominant and controlled by A allele, while the inability to fold the tongue is a recessive trait controlled by the recessive allele, a.

A class of 100 students was asked if they could fold their tongues. Out of all the students in the class, 25 couldn’t fold their tongues while the remaining 75 could. What is the frequency of the aa genotype in the class?

Question4 Not yet Assuming the class is in Hardy-Weinberg equilibrium, what is the frequency of the a allele in the class? Points out of 1.00 Select one: O 0.10 0.20 0.25 0.50 0.75 Flag question Question 5 Not yet How many students in the class should be homozygous allele (AA) if the class is in Hardy-Weinberg equilibrium? for the ot Points out of 1.00 Select one: 10 20 25 50 75 Flag question

Explanation / Answer

For the first question:

To obtain the allele a frequency:

Alleles:

Genotype:

The total of recessive genotypes present in the class (aa): 25

Total of recessive alleles: 50

Allele frequency is calculated by dividing the number of times the allele is observed in a population by the total number of copies of all the alleles within the population (in this case, 200, 100 x 2, each student has two alleles).

50/200: 0.25

For the second question:

The Hardy-Weinberg equation is as follows:

p2 + 2pq + q2

p2= .25

q2= .25

.25 x 100 = 25

25 students will be homozygous for the dominant trait.

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