Assume that the ability or inability to fold the tongue is controlled by a singl
ID: 190057 • Letter: A
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.
How many students in the class should be homozygous for the other, dominant allele (AA) if the class is in Hardy-Weinberg equilibrium?
Select one:
10
20
50
75
WHY is it 25? HELP
Explanation / Answer
How many students in the class should be homozygous for the other, dominant allele (AA) if the class is in Hardy-Weinberg equilibrium?
C) 25
The correct answer is 25. Here A is dominant over a. The students with the ability to rotate tongue will have the genotype of either AA or Aa while the students without the ability to rotate tongue will have the genotype of aa.
So, the (AA + Aa) : aa = 3:1
As we come to know AA : Aa : aa = 1:2:1
So, the number of AA (homozygous that can rotate the tongue) will be 25.
And the number of aa (homozygous that cannot rotate the tongue) will be 25.