Ở ruồi giấm, giả sử cặp gen thứ nhất gồm 2 alen A,...

D

- Hướng dẫn giải

\(% MathType!MTEF!2!1!+-% feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9% vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x% fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyqaiaadg% gacqGHxdaTcaWGHbGaamyyaiabgkziUkaaigdacaWGbbGaamyyaiaa% cQdacaaIXaGaamyyaiaadggaaaa!431B!Aa \times aa \to 1Aa:1aa\)

\(% MathType!MTEF!2!1!+-% feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9% vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x% fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaaSaaaeaaca% WGcbGaamizaaqaaiaadkgacaWGebaaaiabgEna0oaalaaabaGaamOy% aiaadsgaaeaacaWGIbGaamizaaaacqGHsgIRdaqadaqaaiaaicdaca% GGSaGaaG4maiaadkeacaWGKbGaaiOoaiaaicdacaGGSaGaaG4maiaa% dkgacaWGebGaaiOoaiaaicdacaGGSaGaaGOmaiaadkgacaWGKbGaai% OoaiaaicdacaGGSaGaaGOmaiaadkgacaWGKbaacaGLOaGaayzkaaGa% amOyaiaadsgaaaa!5644!\frac{{Bd}}{{bD}} \times \frac{{bd}}{{bd}} \to \left( {0,3Bd:0,3bD:0,2bd:0,2bd} \right)bd\)

\(% MathType!MTEF!2!1!+-% feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9% vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x% fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGceaqabeaacqGHsg% IRcaaIWaGaaiilaiaaiodadaWcaaqaaiaadkeacaWGKbaabaGaamOy% aiaadsgaaaGaaiOoaiaaicdacaGGSaGaaG4mamaalaaabaGaamOyai% aadseaaeaacaWGIbGaamizaaaacaGG6aGaaGimaiaacYcacaaIYaWa% aSaaaeaacaWGcbGaamiraaqaaiaadkgacaWGKbaaaiaacQdacaaIWa% GaaiilaiaaikdadaWcaaqaaiaadkgacaWGKbaabaGaamOyaiaadsga% aaaabaGaamiwamaaCaaaleqabaGaamyraaaakiaadMfacqGHxdaTca% WGybWaaWbaaSqabeaacaWGfbaaaOGaamiwamaaCaaaleqabaGaamyz% aaaakiabgkziUkaadIfadaahaaWcbeqaaiaadweaaaGccaWGybWaaW% baaSqabeaacaWGfbaaaOGaaiOoaiaadIfadaahaaWcbeqaaiaadwea% aaGccaWGybWaaWbaaSqabeaacaWGLbaaaOGaaiOoaiaadIfadaahaa% WcbeqaaiaadweaaaGccaWGzbGaaiOoaiaadIfadaahaaWcbeqaaiaa% dwgaaaGccaWGzbaaaaa!6B01!\begin{array}{l} \to 0,3\frac{{Bd}}{{bd}}:0,3\frac{{bD}}{{bd}}:0,2\frac{{BD}}{{bd}}:0,2\frac{{bd}}{{bd}}\\{X^E}Y \times {X^E}{X^e} \to {X^E}{X^E}:{X^E}{X^e}:{X^E}Y:{X^e}Y\end{array}\)

Tỷ lệ kiểu hình đời con có 3 tính trạng trội và 1 tính trạng lặn là:

\(% MathType!MTEF!2!1!+-% feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9% vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x% fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaaSaaaeaaca% aIXaaabaGaaGOmaaaacaWGHbGaamyyaiabgEna0kaaicdacaGGSaGa% aGOmamaalaaabaGaamOqaiaadseaaeaacaWGIbGaamizaaaacqGHxd% aTcaaIWaGaaiilaiaaiEdacaaI1aGaamiwamaaCaaaleqabaGaamyr% aaaakiabgUcaRmaalaaabaGaaGymaaqaaiaaikdaaaGaamyqaiaadg% gadaqadaqaaiaaicdacaGGSaGaaG4mamaalaaabaGaamOqaiaadsga% aeaacaWGIbGaamizaaaacqGHRaWkcaaIWaGaaiilaiaaiodadaWcaa% qaaiaadkgacaWGebaabaGaamOyaiaadsgaaaaacaGLOaGaayzkaaGa% ey41aqRaaGimaiaacYcacaaI3aGaaGynaiaadIfadaahaaWcbeqaai% aadweaaaGccqGHRaWkdaWcaaqaaiaaigdaaeaacaaIYaaaaiaadgea% caWGHbGaey41aqRaaGimaiaacYcacaaIYaWaaSaaaeaacaWGcbGaam% iraaqaaiaadkgacaWGKbaaaiabgEna0kaaicdacaGGSaGaaGOmaiaa% iwdacaWGybWaaWbaaSqabeaacaWGLbaaaOGaamywaiabg2da9iaaic% dacaGGSaGaaG4maiaaikdacaaI1aaaaa!78E1!\frac{1}{2}aa \times 0,2\frac{{BD}}{{bd}} \times 0,75{X^E} + \frac{1}{2}Aa\left( {0,3\frac{{Bd}}{{bd}} + 0,3\frac{{bD}}{{bd}}} \right) \times 0,75{X^E} + \frac{1}{2}Aa \times 0,2\frac{{BD}}{{bd}} \times 0,25{X^e}Y = 0,325\)