Which of the following is a cross-breed of sheep?

Differentiate between inbreeding and outbreeding.

The mule is a:

Give scientific reasons: Inbreeding is necessary to obtain a pure line.

Which factor is responsible for the variation in genetic makeup within a specific breed of domesticated animals?

$A$ superior female,in the case of cattle,is the $A$ that produces more milk per lactation. On the other hand,a superior $B$ is that $C$ which gives rise to $D$ as compared to those of other males. Here $A$ and $D$ refer to: