Question

What are the Hardy-Weinberg predictions for TT, Tt, and tt?

TT	41
Tt	36
tt	33
Total	110

Answer 1

Let's calculate the frequency of TT

The number of TT genotype is 41 and total no of progeny are 110 so

=41/110

=0.37

Now calculate the frequency of Tt

=36/110

=0.33

Lastly the frequency of tt

=33/110

=0.3

Now let's calculate the frequency of Allele T and t

Allele frequency T is

We know

p+q=1

p is the frequency of Allele T

And q is the frequency of Allele t

Expansion of the above equation is to know for allelic frequency is

(p + q)2 = p​​​​​​2 + 2pq + q​​​​​​2 = 1

But we can also calculate allele frequencies by using the following formula

Where N is the total number of individuals in the population

p = 2N(TT)+N(Tt)/2N

p= 2*41+36/2*110

=118/220

p=0.54

By using same formula calculate q

q=2N(tt)+N(Tt)/2N

=2*33+36/220

q=0.46

Now predict the expected genotype in population by putting the value of p and q in equation

p2+2pq+q2=1

(0.54)²+2(0.54*0.46)+(0.46)²=1

0.29+0.50+0.21=1

So TT=29%

Tt=50%

And tt=21%

Hope this calculation help you