The expression of genes for the production of milk in only females is a

$A$ farmer crossed a walnut-combed chicken with a single-combed one and obtained all walnut-combed chickens in $F_1$. The genotype of the parents was

If an agouti mice $(CcAa)$ is crossed with an albino mice $(ccAA)$,then how many albino mice are produced in the resulting progeny?

When a trait is inherited only from the female parent,it primarily indicates:

The ratio of $9:7$ is obtained as a result of:

In a cross between white-flowered parents,$F_1$ progeny was uniformly purple-flowered. The $F_2$ progeny showed a phenotypic ratio $9:7$ between purple-flowered and white-flowered plants. The above result indicates that the flower colour is controlled by