Cho biết mỗi gen quy định một tính trạng, các

* Hướng dẫn giải

А: $\frac{AB}{ab}Dd\times \frac{AB}{ab}Dd\to \left(1\frac{AB}{AB}:2\frac{AB}{ab}:1\frac{ab}{ab}\right)\left(1DD:2Dd:1dd\right)$

$\to KG:\left(1:2:1\right)\left(1:2:1\right),KH:\left(3:1\right)\left(3:1\right)$

$B:\frac{Ab}{ab}Dd\times \frac{aB}{ab}dd\to \left(1\frac{Ab}{aB}:1\frac{Ab}{ab}:1\frac{aB}{ab}:1\frac{ab}{ab}\right)\left(1Dd:1dd\right)$

$\to KG,KH:\left(1:1:1:1\right)\left(1:1\right)$

$C:\frac{Ab}{aB}{X}^D{X}^d\times \frac{aB}{ab}{X}^{D}Y\to \left(1\frac{Ab}{aB}:1\frac{aB}{aB}:1\frac{Ab}{ab}:1\frac{aB}{ab}\right)\left(1X^D{X}^D:1X^D{X}^d:1X^{D}Y:X^{d}Y\right)$

$\to KG:\left(1:1:1:1\right)\left(1:1:1:1\right),KH:\left(1:2:1\right)\left(3:1\right)$

$D:\frac{AB}{ab}{X}^{D}Y\times \frac{aB}{ab}{X}^d{X}^d\to \left(1\frac{AB}{aB}:1\frac{AB}{ab}:1\frac{aB}{ab}:1\frac{ab}{ab}\right)\left(1X^D{X}^d:1X^{d}Y\right)$

$\to KG:\left(1:1:1:1\right)\left(1:1\right);KH:\left(1:2:1\right)\left(1:1\right)$

Chọn B