Ta có : \(A=T=200(nu)\)

Mà : \(2A+2G=1200(nu)\) \(\Rightarrow G=X=4000\left(nu\right)\)

a.

N = (5100 : 3,4) . 2 = 3000 nu

2A + 2G = 3000

A/G = 2/3

-> A = T = 600 nu, G = X = 900 nu

A1 = T2 = 150 nu

G1 = X2 = 540 nu

T1  = A2 = 600 - 150 = 450 nu

X1 = G2 = 900 - 540 = 360 nu

b.

H = 2A + 3G = 3900 

HT = 2N - 2 = 6998 

\(a,L=3,4.\dfrac{N}{2}=5100\left(\overset{o}{A}\right)\)

\(b,H=N+G=3600\left(lk\right)\)

- Liên kết hóa trị của gen: \(2\left(N-1\right)=5998\left(lk\right)\)

\(c,\) \(A=T=1500-600=900\left(nu\right)\)

\(A_1=T_2=40\%.1500=600\left(nu\right)\)

\(\rightarrow A_2=T_1=900-600=200\left(nu\right)\)

\(G_1=X_2=20\%.1500=300\left(nu\right)\)

\(\rightarrow G_2=X_1=600-300=300\left(nu\right)\)

a) T=A=600 nu

N=600/20%=3000 nu

G=X=\(\frac{3000-600.2}{2}=900nu\)

b) L=\(\frac{3,4N}{2}=\frac{3,4.3000}{3}=5100\)A^o

Câu 4:

N = 2A + 2G = 2000 nu

H = 2A + 3G = 2500

L = N/2 . 3,4 = 3400 A^o

Câu 5:

N = M : 300 = 1800 nu

2A + 2G = 1800

A = 2G

-> A  = T = 600, G = X = 300

A = T = 900 nu

G = X = 3000 : 2 - 900 = 600 nu

%A = %T = 900 : 3000 = 30%

%G = %X = 50% - 30% = 20%

H = 2A + 3G = 3600

C = 3000 : 20 = 150